braje & erlandson - looking forward, looking back

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  • 8/18/2019 Braje & Erlandson - Looking Forward, Looking Back

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    Looking forward, 

    looking back: 

    Humans, 

    anthropogenic 

    change,and

     

    the 

    Anthropocene

    Todd J. Braje a,*, Jon M. Erlandson b

    a San  Diego  State  University,  Department   of    Anthropology,  San  Diego,  CA  92182-6040,  United  StatesbMuseum  of   Natural  and  Cultural  History  and  Department   of    Anthropology,  University  of   Oregon,  Eugene,  OR  97403-1224,  United  States

    Introduction

    The  proposal  to  formally  designate  an  Anthropocene   Epoch   has

    become   a  hot  issue  over  the  last  several  years,  championed   or

    contested   by  the  public,  media,  and  scientists.  The  response  has

    been  powerful   enough   to  garner   the  cover  story  on  the  May  26,

    2011,  edition  of   The  Economist , numerous   articles  in  top-tier

    academic   journals  such   as  Science  (e.g.,  Balter,  2013;  Cooper   et  al.,

    2012),  Nature  (e.g.,  Crutzen,   2002,  2010;   Jones,  2011), and

    Proceedings  of   the  National   Academy  of   Sciences  (e.g.,  Beerling

    et  al.,  2011;  Smol   et  al.,  2005),   and  the  founding   of   this   journal

    dedicated  to  the  topic.   The  designation  of   an  Anthropocene   could

    be  a  milestone  in  the  geological  and  social  sciences,  an  idea  that   has

    been  building  for  140  years  since  Italian  geologist  Antonio

    Stoppani   first   proposed  an  ‘‘anthropozoic   era’’  in  AD  1873  (see

    Crutzen,   2002;  Goudie,   2000:  4–5).

    Witha   world  population  of   more  than  7.2  billion,   it  is  difficult  to

    argue  that  we  are not  currently  living   in  an  ‘‘age  of   humans.’’  The

    acceleration   of   CO2,   CH4,   and  N2O  in  atmospheric   records  (Crutzen

    and  Steffen,   2003),  the  explosion   in  global   human  populations

    (McNeill,   2000), anthropogenic  land  surface  clearance  (Ellis,   2011;

    Ellis   et  al.,  2013;   Vitousek   et  al.,  1997),  the  crisis   of   our  world’s   oceans

    from  overfishing,   ocean  acidification,  and  pollution   ( Jackson  et  al.,

    2001;   Pauly   et  al.,   1998),  the  appearance  of   radio-nucleotides  from

    atomic  detonations  (Crutzen  and  Steffen,   2003),  and  much  more  all

    provide   ample   evidence that  human  alterations   of   Earth’s   natural

    systems   have  become  pervasive   and  ubiquitous.

    The  major point  of contention, at  least among  the geoscien-

    tists,  has been  the starting date for the Anthropocene  (for   an

    alternate view see  Crist, 2013).   Most have proposed  to either

    divide   the Holocene  –  already  the shortest  geologic  epoch

    beginning    just 11,700   calendar   years   ago –  into a  smaller

    temporal unit or  do  away   with it  altogether (Doughtry   et  al.,

    2010;   see   Foley  et  al.,  2014 for a  brief   summary).   For some, the

    compression of the Holocene  follows  a  sensible trend because

    more  recent  data on  global climatic  patterns and stratigraphic

    records are of   higher resolution,  but others consider  such short

    geologic epochs to be  out of synch  with geological timelines

    ( Jones, 2011).   In our  view,  the Holocene  has   always been

    something   of   an  anomaly,   one of    several interglacial cycles

    within the Pleistocene,   none  of   the earlier  examples   of   which

    warrantedsimilar designations  (Smith  andZeder,  2014),   if   not  for

    the actions of   humans (Erlandson,   2014).

    After  the  submission  of   a  proposal  to  formally  designate  the

    Anthropocene   by  the  Stratigraphy  Commission  of   the  Geological

    Anthropocene  4  (2013)  116–121

    A  R   T  I   C  L   E  I   N  F   O

     Article history:

    Received  10   June  2013Received in revised form 7 March 2014

    Accepted  20  May  2014

    Available online 29 May 2014

    Keywords:

    Anthropocene

    Archaeological  perspectives

    Human  impacts

    A   B  S  T  R   A  C  T

    As acceptance of the Anthropocene grows among scientists and the public, decisions must be made on

    whetherand howto define thisgeologicepoch.Designatinga startingpointfor theAnthropocenemaybe

    less important than understanding the cultural processes that contributed to human domination of 

    Earth’s natural systems. Just as climate changes and their consequences often occur over centuries,

    millennia, or more, archaeological records show thathumans havebeenactive agents of environmental

    change for thousands of years. Their effects, often dramatic and cumulative, have grown from local, to

    regional, and now global phenomena. We discuss five options for defining the Anthropocene, most of 

    which recognize a deeper history of widespread and measurable effects of human activities on the

    Earth’s surficial biological and physical systems. A primary goal of debating and defining the

    Anthropocene should be to educate thepublic about theeffectshumanshave hadon natural systemsfor

    millennia, the compounding nature of such impacts, and the pressing need to reverse current trends.

    2014 Elsevier Ltd. All rights reserved.

    *  Corresponding   author.  Tel.:  +1  619  594  4175;  fax:  +1  619  594  1150.

    E-mail  addresses:  [email protected]  (T.J.  Braje),

     [email protected]  (J.M.  Erlandson).

    Contents 

    lists 

    available 

    at 

    ScienceDirect

    Anthropocene

    journ al  hom epage:  ww w.els  evier  .com/locat  e/an c en e

    http://dx.doi.org/10.1016/j.ancene.2014.05.002

    2213-3054/ 2014  Elsevier   Ltd.  All  rights  reserved.

    http://dx.doi.org/10.1016/j.ancene.2014.05.002http://dx.doi.org/10.1016/j.ancene.2014.05.002http://dx.doi.org/10.1016/j.ancene.2014.05.002http://dx.doi.org/10.1016/j.ancene.2014.05.002http://dx.doi.org/10.1016/j.ancene.2014.05.002http://dx.doi.org/10.1016/j.ancene.2014.05.002http://dx.doi.org/10.1016/j.ancene.2014.05.002mailto:[email protected]:[email protected]:[email protected]:[email protected]://www.sciencedirect.com/science/journal/aip/22133054http://www.elsevier.com/locate/ancenehttp://www.elsevier.com/locate/ancenehttp://www.elsevier.com/locate/ancenehttp://www.elsevier.com/locate/ancenehttp://www.elsevier.com/locate/ancenehttp://www.elsevier.com/locate/ancenehttp://www.elsevier.com/locate/ancenehttp://www.elsevier.com/locate/ancenehttp://www.elsevier.com/locate/ancenehttp://www.elsevier.com/locate/ancenehttp://www.elsevier.com/locate/ancenehttp://www.elsevier.com/locate/ancenehttp://www.elsevier.com/locate/ancenehttp://www.elsevier.com/locate/ancenehttp://www.elsevier.com/locate/ancenehttp://dx.doi.org/10.1016/j.ancene.2014.05.002http://dx.doi.org/10.1016/j.ancene.2014.05.002http://www.elsevier.com/locate/ancenehttp://www.sciencedirect.com/science/journal/aip/22133054mailto:[email protected]:[email protected]://dx.doi.org/10.1016/j.ancene.2014.05.002http://crossmark.crossref.org/dialog/?doi=10.1016/j.ancene.2014.05.002&domain=pdfhttp://crossmark.crossref.org/dialog/?doi=10.1016/j.ancene.2014.05.002&domain=pdf

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    Society  of   London   (Zalasiewicz  et  al.,  2008),  an  Anthropocene

    Working   Group  was  created  to  evaluate  its  merits.  Posted  on  the

    Subcommission  on  Quaternary   Stratigraphy’s  2009  Working   Group

    on  the  ‘Anthropocene’   webpage,  the  outline  of   activities  detailed

    that  the  group  was  to  be:

    ideally.  .  .composed   of   Earth  scientists  with  worldwide  repre-

    sentation   and  familiar   with  deep  time  stratigraphy   history

    (Cenozoic  and  older),   with   Quaternary  (including  Holocene)

    stratigraphy,   and  with   relevant   aspects   of   contemporaryenvironmental  change  (including  its  projection  by  modeling

    into  the  future).  It  should  critically   compare  the  current  degree

    and  rate  of   environmental  change,  caused  by  anthropogenic

    processes,   with   the  environmental  perturbations  of   the  geologi-

    cal  past.   Factors   to  be  considered  here  include  the  suggested   pre-

    industrial   modification  of   climate   by  early  human  agrarian

    activity   (Outline  of   Working Group  Activities,   2009).

    This   22-person  working  group  is  dominated  by  geoscientists

    and  paleoclimatologists,  but  included   an  environmental   historian

    and  a   journalist.  Despite  the  specific  call  to  deal  with  the

    environmental   impacts  of   pre-industrial  societies,  archaeologists

    trained  to  investigate  the  complex   dynamics   of   human–environ-

    mental   interactions   and  evaluate  when   humans   first  significantly

    shaped   local,  regional,  and  global  climatic  regimes,  were   notincluded.   As  a  result  of   our  symposium  at  the  April  2013  Society  for

    American   Archaeology  annual   meetings  in  Honolulu,   however,

    archaeologist  Bruce  Smith  was  added  to  the  working  group.   Since

    designations  of   geologic  timescales  and  a  potential   Anthropocene

    boundary,   determined  by  physical  stratigraphic  markers  (Global

    Stratigraphic  Section  and  Point,   often  called  a  ‘‘golden  spike’’)  or  a

    numerical   age  (Global  Standard   Stratigraphic  Age),  are  the  domain

    of   geoscientists,  perhaps   this   is  not  surprising.  What  makes  this

    designation  different  from   all  previous  geologic  time   markers  is

    that  it  is  directly   tied  to  human   influences.   Logically,  therefore,   it

    should   involve  collaboration  with  archaeologists,  anthropologists,

    and  other  social  scientists.

     Archaeological  perspectives  on  the   Anthropocene

    The  papers  in  this   special  issue  are  the  result  of   discussions,

    debates,  and  dialogue  from  a  2013  Society  for  American

    Archaeology   symposium  centred   around  archaeological  perspec-

    tives  on  the  Anthropocene.   We  brought   together  a  diverse  group  of 

    archaeologists  to  explore  how  and  when   humans   began  to  have

    significant  and  measurable  impacts   on  Earth’s   ecosystems  (Fig.  1).

    In  this   special  issue,  the  symposium  participants   explored  the

    processes  that   contributed   to  a  human  domination   of   the  Earth

    that  has  unfolded   over  millennia.

    This  special  issue  demonstrates   that   archaeologists  have  much

    to  offer  in  defining   the  Anthropocene   and  understanding   the

    complex   cultural   and  ecological  processes  that  have  contributed   to

    it.   Just  as  natural   climatic  changes   and  their  consequences   often

    occur  over  centuries   or  millennia,  humans  have  actively  shaped

    terrestrial  and  aquatic  ecosystems  for  millennia.  Their  effects,

    often  dramatic,  are  cumulative   and  compounding.   While  archae-

    ologists  work  at  local  or  regional  scales,  the  activities  of   a  global

    community   of   humans,   taken  together,  can  result  in  human   action

    that  is  planetary  in  scope.   Human   induced   extinctions,   the  creation

    of   shell  middens,  agricultural   fields,  and  other  anthropic   soils,

    constructions   of   mines,  harbours,   canals,  and  earthworks,  the

    diversion  of   rivers  and  filling  of   estuaries,  the  transportation   of plants,  animals,  and  raw  materials,  and  more   all  began  thousands

    of   years  ago  (Fig.  2).  Taken  together,  anthropogenic   changes   at  a

    global  scale  began  well  before  the  Industrial  Revolution.

    Since  the  Anthropocene   is  explicitly  defined   by  the  effects  of 

    human  activity  on  natural  ecosystems,  it  is  worth  considering   that

    hominins   have   been  part   of   those  natural   landscapes   for  several

    million  years.  This   includes   our  own  omnivorous   species,  Homo

    sapiens  sapiens,   a  keystone  predator,   broad-based  herbivore,  and

    active  shaper   of   ecosystems  and  landscapes  for  millennia.  Whether

    people   are  defined   as  part   of   the  natural   world  or  not,   the

    appearance   of   anatomically  modern   humans   (AMH)   and  their

    rapid  spread  around   the  world  –  from  Africa  to  Eurasia,  Australia,

    Fig.  1.  Timeline  illustrating  a  variety  of   significant  cultural  events,  which  have  had  clear   and  lasting  impacts  on   Earth’s  ecosystems.

    T.J.  Braje,   J.M.  Erlandson  /   Anthropocene  4  (2013)  116–121  117

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    the  Americas,  and  hundreds   of   remote   oceanic  islands  –  can  be

    identified  in  the  form  of   human   skeletal  remains  found   in

    archaeological   sites.  The  physical  presence   of   AMH  around   the

    world  could,   in  fact,  be  seen  as  a  definitive  and  broad-based  faunal

    marker   for  the  inception  of   the  Anthropocene.   It  would   blur  any

    definition   of   the  inception  of   the  Anthropocene,   however,  because

    AMH  appeared  in  Africa  at  least  200,000  years  ago,  but  did  not

    reach  many  remote   islands  until  roughly  1000  years  ago  or  less.

    Specific  human   constructed   stratigraphic  markers  of   theAnthropocene   also  have   been  proposed   as  a  ‘‘golden  spike.’’

    Through   the  lens  of   a  hypothetical   geologist  living  a  100  million

    years  from  now,   Zalasiewicz  (2008)  proposed  that  the  buried  urban

    landscapes   and  artefacts  coinciding   with  the  Industrial  Revolution

    would   designate  the  Anthropocene.   Edgeworth  (2013)  argued  that

    significant   human  impacts   on  Earth’s   surface  consist  of   a  wider

    range  of   anthropogenic   features,  including   ‘‘Neolithic  tells,  plaggen

    soils,  sediment   built  up  behind   early  dams,  Roman  occupation

    debris,  mediaeval  castle  earthworks.  .  .together  with  later  indus-

    trial  age  deposits.’’  Erlandson  (2014)  points   to  shell  midden   soils  as

    another   globally  distinctive  marker  of   the  Anthropocene,   for  which

    an  8000–10,000  year  old  genesis  may  be  most   appropriate.

    Roosevelt  (2014)  and  others   have  noted  the  anthropic   terra  preta

    (dark 

    earth) 

    soils 

    of  

    the 

    Amazon 

    as 

    another 

    pedogenic 

    marker 

    of widespread  human   modification  of   Earth’s   natural   ecosystems.

    Archaeological   evidence  for  such   ancient   landscape  modifications

    is  also  mounting,   increasing  the  pressure  on  those  who  claim  that

    prehistoric  peoples  had  only  limited  effects  on  the  Earth’s   surface.

    Beginning  500–1000  years  ago,  the  effects  of   European

    exploration,   economic   expansion,  and  globalization  also  resulted

    in  the  rapid  spread  of   a  distinctive  group  of   domesticated  animals

    (dogs,  horses,  cattle,  sheep,  goats,  pigs,  chickens,  etc.)  and  plants

    (wheat,  corn,   potatoes,  rice,  etc.),  creating   a  global  faunal   and  floral

    horizon   that   will  be  unmistakable  to  future   scientists  as  markers  of 

    the  Anthropocene   (Lightfoot  et  al.,  2014). This  was  not  a  one-way

    Eurocentric   phenomena,   moreover,  as  the  spread  of   domesticates

    moved  from  the  Old  World  to  the  New  World  and  vice  versa.  These

    cultural 

    contacts 

    also 

    spread 

    deadly 

    infectious 

    diseases 

    that 

    had

    disastrous  consequences   for  human  populations   and  cultures.  Such

    disease  epidemics  caused   millions  of   deaths   and  dramatic   cultural

    changes   worldwide,  all  in  a  period  of   four  to  five  centuries.   Today,

    the  consequences   of   this  ‘‘Columbian  exchange’’   are  clearly  evident

    in  archaeological  records   worldwide  and  will  continue   to  be  visible

    to  future   archaeologists  and  geoscientists.  If   it  is  decided  that  the

    Holocene   should   continue   to  be  recognized,   such   global  changes

    could  also  be  used  as  a  boundary   marker  between  the  end  of   the

    Holocene   and  the  beginning  of   the  Anthropocene.What   the  papers   in  this   special  issue  illustrate  is  that   specific

    thresholds,  tipping  points,  or  developmental  indicators   used  to

    define  the  start  of   the  Anthropocene   are  often  directly  influenced

    by  the  research  agenda  of   the  author.   This   is  not  a  case  of   self-

    reflexivity,  but  a  consequence   of   the  inherent   challenges  of 

    defining   ‘‘human  domination.’’   Foley  et  al.  (2014)  proposed   to

    define  the  beginning  of   the  Anthropocene   at  AD  1780,  but  to  coin   a

    new  term   and  unofficial   geological  period,  the  Palaeoanthropo-

    cene,   marking  a  more   nebulous   time  interval  before  the  Industrial

    Revolution  when  humans   transformed  local  and  regional  environ-

    ments   with  effects  that  varied  across   time  and  space.  As  a

    transitional  time  period,  the  Palaeoanthropocene   would   not

    compete   as  a  geologic  epoch,   but  cover  the  ancient   impacts   of 

    humans 

    prior 

    to 

    when 

    ‘‘the 

    burning 

    of  

    fossil 

    fuels 

    produced 

    hugecrescendo

      in  anthropogenic   effects’’  (Foley  et  al.,  2014).  This   idea

    may  have  merit  as  a  compromise,  if   the  only   thing   at  stake  is  the

    composition  of   our  geologic  timescales.

     What 

    is 

    at 

    stake?

    One  of   the  most   compelling  parts  of   the  Anthropocene   debate   is

    the  attention  it  has  generated  among   the  media  and  public.  The

    International   Commission  on  Stratigraphy  (ICS)  working  group

    will  evaluate  the  proposal   to  designate  the  Anthropocene   in  the

    same  way  used   to  define   all  preceding   geological  epochs   from  the

    Cambrian   onwards   –  on  the  basis  of   ‘‘golden  spikes’’  or  a  date  of 

    inception   –  then   make   a  recommendation   that   will  be  ratified  or

    rejected 

    by 

    the 

    ICS 

    (Gradstein 

    et 

    al., 

    2004). 

    For 

    most 

    scientists 

    who

    Fig.  2.  Photographs  depicting  the  impacts  of   ancient  humans  on   Earth’s  ecosystems:  (A)  a  woolly  mammoth,  which  was  driven  to  extinction,  likely   in   part  by  humans,  during

    the  Late  Pleistocene;  (B)  ruins  of   the  ancient  city  of   Tikal,   where  Mayan  farmers  slashed  and  burned  vast  sections  of   native  forest  to  support  growing  populations  and  a  state-

    level  socio-political   system;  (C)  terraced  agricultural  fields  in   Sa   Pa,  Vietnam;  (D)   the  Roman  Colosseum  remains  a  landmark  of   the  first   city  to  reach  one  million   residents

    more  than  2000  years  ago.

    T.J.  Braje,   J.M.  Erlandson  /   Anthropocene  4  (2013)  116–121118

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    consult   deep  historical  data,  their  research  agenda,  results,  and

    interpretations  will  be  affected  minimally  or  not  at  all.  The

    designation  of   the  Anthropocene,   however,  has  the  potential  to

    influence   public  opinions   and  policies  related  to  critical  issues  such

    as  climate  change,   extinctions,  modern   human–environmental

    interactions,  population   growth,  and  sustainability.

    One  of   the  growing  theoretical  and  methodological   trends   in

    archaeology  over  the  last  decade   is  towards  a  historical  ecological

    approach,   an  interdisciplinary  field  that  focuses  on  documenting

    long-term  relationships  between  natural   environments   and

    humans  (Crumley,   1994).  Historical  ecologists  view  the  formation

    of   modern   ecosystems  as  the  result  of   lengthy  processes  of   natural

    environmental   change   and  human   influence   (see  Balée and

    Erikson,   2006;   Jackson  et  al.,  2001).  Archaeological  datasets  (i.e.,

    faunal   and  floral  remains,  artifacts,  chronometric   dates,  geochem-

    istry,  and  stratigraphic  analysis)  provide  deep  time   perspectives

    (spanning   decades,   centuries,   and  millennia)  on  the  evolution  of 

    ecosystems,  the  place  of   people   within  them,   and  the  effects

    (positive  and  negative)  humans   have   had  on  such   ecosystems

    through   time   (e.g.,  Balée and  Erikson,   2006;  Braje  and  Rick,  2013;

    Lotze   and  Worm,   2009;  Rick   and  Erlandson,   2008;  Rick   and

    Lockwood,   2013;  Swetnam  et  al.,  1999).

    Historicalecologicaldataalso havean   applied  componentthat

    can  provide  important insights on the relative abundances of flora and  fauna, changes  in biogeography, alterations  in

    foodwebs, landscape  evolution, and much  more. One of the

    significant advantages of utilizing a  historical  ecological

    approach   to  the study of physical  and  biological environments

    is that it provides  a  historic dimension  that helps answer  the

    question ‘‘How did  we  get where  we  are today?’’  (e.g.,  Lepofsky,

    2009; Redman, 1999; Swetnam et  al.,  1999).   Understanding

    environmental change over multiple chronological  and spatial

    scales is essential to  assessing  the condition  of current

    ecosystemsandunderstanding  how  and  whyhealthyor damaged

    ecosystems have evolved  to their current states.  Only with  such

    long-termdata can  we  develop baselines  andprotocols for  future

    policy and effective actions  in environmental management,

    conservation, and  restoration.The  designation  of   an  Anthropocene   Epoch   at  the  dawn   of   the

    Industrial   Revolution,  AD  1950  (Barnosky,  2013),   or  any  other   very

    recent   date  may  reinforce  the  faulty  premise  that  pre-industrial

    humans  lived  in  harmony   with  nature.   The  study  of   human

    impacts   on  the  environment   is  vast  and  extends  back   to  at  least  the

    19th   century.   Over   the  last  several  decades,   however,  it  has

    become   increasingly  apparent   that  ancient   human   populations

    significantly  influenced   local  and  regional  environments,   including

    impacts   to  a  wide  array  of   plant  and  animal  communities   (e.g.,

    Grayson,   2001;  Redman,   1999;  Rick  and  Erlandson,   2008).

    Whether   prehistoric  peoples  acted  as  the  original  conservationists

    (see  Alcorn,   1993)  or  with  no  regard  for  preservation  and

    sustainability  (see  Kay  and  Simmons,   2002;  Smith  and  Wishnie,

    2000) 

    – 

    or 

    some 

    combination 

    of  

    the 

    two 

    (Erlandson 

    and 

    Rick, 

    2010)–  is  still  hotly   contested.   One  thing   the  papers   in  this  issue  clearly

    illustrate,  however,  is  that  as  Europeans   expanded   around   the

    globe,  the  landscapes,  plant  and  animal   species,  and  ecosystems

    they  encountered   had  already  been  shaped  and  altered  by  humans

    for  millennia.

    There is a  growing recognition  of these facts among a  broad

    array  of scientists,  as   attested to  by   the serious  consideration

    being  given to  defining  an   Anthropocene  epoch  or   an   earlier  and

    transitional  Palaeoanthropocene.  If   theAnthropocene concept is

    accepted, as we  believe it should be,   its real power may  lie in its

    potential to  shape public opinion and  policy.  The  Anthropocene

    can   help  provide powerful  scientific legitimacy  among  thepublic

    for anthropogenic  climate  change  and environmental  degrada-

    tion 

    andact 

    as 

    call 

    for increasedconservation 

    efforts 

    andglobal

    awareness.  Austin  and Holbrook  (2012: 61)  argued much the

    same  in   a  recent  issue  of The Geological Society  of   America Today:

    The  most   important  assertion  unfolding   among   these  groups   is

    that   Anthropocene   creates  public  awareness  and  formalizes  the

    concept   of   human-induced   environmental   change.   Although

    we  acknowledge  a  distinct  allure  for  the  term  Anthropocene

    and  recognize  merit  in  the  concept,   pop  culture   does   not  have

    an  interest  in  the  stratigraphic  implications   of   this  debate.  If 

    there  is  an  underlying   desire  to  make  social  comment   about  theimplications  of   human-induced   environmental  change,   Anthro-

    pocene   clearly  is  effective.  However,   being  provocative  may

    have  greater  implications   in  pop  culture   than   to  serious

    scientific  research.

    The  use  of   the  Anthropocene   as  a  public  communication   tool

    should   not,   we  believe,  be  seen  as  a  negative.  In  many   ways,  this  is

    its  most  important   attribute.  The  scientific  community   can  find

    countless   examples  of   our  inability  to  effectively  communicate,

    explain,  and  package  important  scientific  ideas  to  the  public  and

    the  packaging  of   contrarian   views  by  naysayers  and  pseudoscien-

    tists  often  seems  to  have   greater  impact.   For  geologists  and

    biologists,  the  Intelligent  Design  debates  might  be  the  best

    example  (see  Behe,   2001;  Gilbert,  2003);  for  archaeologists  and

    anthropologists,  the  ancient   astronauts   phenomenon   (see  vonDäniken,   1999;  Wilson,  1972)  may  be  most  prominent.   The

    esoteric  debate  over  ‘‘stratigraphic  nomenclature’’   (Austin   and

    Holbrook,   2012: 61),  then,   may  be  less  important  than   the  message

    it  conveys  to  our  global  community   and  the  future   of   human–

    environmental   interactions.

    It  is  critical  for  scientists  to  consider  how  their  designation  of   an

    Anthropocene   starting  point  will  be  interpreted  by  the  public,  and

    to  some   degree,  by  other   scientists.  A  post-Industrial  Revolution

    starting  date   may  suggest,  to  the  uninitiated  at  least,  that

    everything  that   came   before   was  ‘natural.’  Restoration  ecology

    and  conservation  biology,  then,   may  not  need  to  consider   the

    deeper   history  of   human  impacts   that   predate  the  start  of   the

    Anthropocene.   This   would  be  a  giant  step  backward  at  a  critical

    time,  one  that   ignores  decades   of   work   and  progress  by  ecologists,geologists,  paleobiologists,  environmental   historians,  archaeolo-

    gists,  and  many  other  scientists  who  have  demonstrated  the  vast

    array  of   pre-industrial   human   impacts  on  local,  regional,  and  global

    environments.   Now  that  the  ‘shifting  baselines’  concept   has  been

    widely  accepted   (Pauly,  1995;   Jackson  et  al.,  2011) and  is  being

    translated  into  public  policy,  we  should   not  risk  going  backwards.

    Historical  data  are  crucial   to  future   management,  conservation,

    and  restoration  efforts.

    Options  for   an   Anthropocene

    Ultimately,  as  the  papers   in  this  volume  demonstrate,   the

    definition  of   an  Anthropocene   epoch  marked  by  the  human

    domination 

    of  

    Earth’s 

    ecosystems 

    should 

    explicitly 

    recognize 

    thedeep   historical  processes  that   contributed   to  such   domination.

    There   is  little  question  that  a  variety  of   geological  and  archaeolog-

    ical   evidence  will  clearly  illustrate  that   domination   to  future

    scientists.  If   the  value  of   historical  records   now  seems  obvious,

    defining   a  starting  date  for  the  Anthropocene   is   a  trickier  business,

    depending   on  the  specific  criteria  (e.g.,  atmospheric  composition,

    faunal   and  floral  changes,  geochemical   records,  or  specific  ‘marker’

    fossils  such   as  AMH  and  domesticated  dogs,  cattle,  horses,  sheep,

    pigs)  utilized.  Although   we  favour  a  starting  date   of  10,000  cal  BP

    and  the  merging  of   the  Anthropocene   and  Holocene,   any  inception

    date   is  bound  to  be  at  least  somewhat  arbitrary.  Consequently,  a

    beginning  date  of   AD  1950  or  AD  2000  could  be  acceptable  if   the

    long   process   that   led  to  human   domination   of   the  Earth  is  explicitly

    recognized.

    T.J.  Braje,   J.M.  Erlandson  /   Anthropocene  4  (2013)  116–121  119

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    As  a  lightning  rod  for  galvanizing  future   environmental

    management   and  a  call-to-arms  for  public   involvement  in  helping

    solve  our  world’s  environmental   crises,  the  Anthropocene   should

    help  focus   attention  on  better  understanding   the  deep,  complex,

    and  ongoing   history  of   human   impacts  on  local,  regional,  and

    global  scales.  Here   we  offer  several  options   for  consideration  by  the

    ICS  and  the  growing  and  global  community   of   scientists  interested

    in  the  definition  of   an  Anthropocene   epoch.

    1.  Follow  the  suggestion  of   Smith  and  Zeder  (2014)  by  merging  the

    Holocene   and  Anthropocene   into   one  geologic  epoch.   The

    Holocene   is  defined   relatively  arbitrarily,  tenuously   in  our

    opinion,   as  it  was  not  clearly  differentiated  from  previous

    interglacial  periods  within  the  Pleistocene  prior  to  anthropo-

    genic  global  warming.  There  is  also  only  limited  evidence   of 

    lasting  human   impacts   on  local,  regional,  or  global  scales  prior  to

    domestication,   agriculture,  and  the  more   pervasive  niche

    construction   that  began  roughly  10,000  years  ago.  If   adopted,

    scientists  and  the  public  will  have   to  confront   the  long,  complex

    processes  of   human–environmental   interactions   that   have

    shaped   the  modern   world.2.

      Similar  to  option   1,  completely   replace  the  Holocene   with  the

    Anthropocene.   The  Holocene   is  a  loaded  term  that   may  never

    have   been  officially  recognized  if   not  for  the  effects  of   pervasivehuman  actions   and  historical  events   (e.g.,  the  widespread  shift

    from  hunting   and  gathering  to  agricultural   economies,   the  rise

    of   state  level  societies,  pervasive  changes   in  landscapes   due  to

    human  manipulation)   that  coincided   with  an  interglacial  period.

    The  Anthropocene   is  a  more   explicit  term  for  a  similar  concept.3.

      Define  the  Anthropocene  as  beginning   in  AD  1500,   approximating

    the  beginning  of   the  Columbian  Exchange  (Crosby,   1972,  1986;

    Thomas,  1989,   1990),   which  created  vast  faunal,   floral,   ecological,

    and  cultural changes  globally   (Lightfoot   et  al.,  2014).  This  option

    has  the  advantage  of   having  a  clear  and  worldwide   paleontologi-

    cal,   stratigraphic,   and  chronological  delineation   –  with   the  rapid

    spread  of   domesticated  plants   and  animals   and  major  ecological

    changes  around  the  world,   including  in  many  remote  islands   that

    are  hotspots  of   biodiversity.   It  might  also  be  seen   by  many  as  areasonable  compromise  between   claims   for  a  very   recent  or  much

    more  ancient  inception  for  the  Anthropocene.4.

      Define  the  Anthropocene   as  beginning  in  AD  2000,  when   the

    effects  of   humans   were  first  widely  recognized   by  the

    geosciences  community   (Crutzen,   2002;  Crutzen   and  Steffen,

    2003;  Vitousek  et  al.,  1997).  Such   an  approach   does   not  define

    when   past  human  societies  began  to  influence   Earth  systems,

    but  focuses  on  our  attempts   to  better  understand   and  mitigate

    the  effects  of   humans  on  global  systems.  This   would  establish

    the  Anthropocene   as  a  critical  area   of   inquiry,   relevant  for

    academics   and  the  public.

    5.  Reject   the  Anthropocene   as  a  formal  geological  epoch,   but  retain

    it  as  an  informal  and  purely   heuristic  device.  Since   the  term  will

    continue 

    to 

    carry 

    an 

    increasing 

    amount 

    of  

    political 

    baggage 

    inthe  court  of   public  opinion,   the  ICS  and  GSA  could  still  recognize

    the  deep   historical  process  of   human–environmental   interac-

    tions   that   have  resulted  in  human  domination   of   the  Earth.

    When  the  Anthropocene   began  would  depend   on  a  variety  of 

    shifting  baselines,  including   complex   spatial,  scalar,  and

    criteria-specific  factors.  The  Anthropocene   began  for  Hawaiian

    terrestrial  flora   and  fauna,   for  example,  a  thousand   years  ago,

    when   Polynesians  first  landed   and  began  dramatically  trans-

    forming   terrestrial  ecosystems  (see  Rick   et  al.,  2014).  It

    accelerated  and  intensified  in  Hawai’i,  however,  after  European

    contact   and  the  American   takeover  of   the  islands.

    Of   these  five  options,   we  prefer  the  first  or  the  second.   These

    recognize 

    the 

    deep 

    history 

    of  

    widespread 

    human 

    impacts 

    and 

    send

    a powerful  message  to  the  scientific  community   and  public  about

    the  role  humans   have  played  in  creating   our  modern   environmen-

    tal  crises.  They   also  are  broad-based  with  clear  stratigraphic  and

    chronological   resolution  in  global  environmental  records,  and

    established  connections   to  human-induced   changes   that   seem

    appropriate  for  an  Anthropocene   epoch.

    Ultimately,  however  the  Anthropocene   is   defined,   it  is

    important   to  recognize  the  deep  historical  processes  that   underlie

    it.  Likewise,  an  important   practical   goal  should   be  to  use  the

    Anthropocene   to  educate   the  public  and  policy   makers  about   the

    effects  humans   have   had  on  natural   systems  for  millennia,  the

    compounding   nature   of   these  impacts,  and  the  pressing  need  to

    reverse  the  dangerous   trends   and  trajectories  we  have   created.

     Acknowledgements

    We  thank   all  the  contributors   to  this   volume,  the  many

    anonymous   reviewers  who  helped   strengthen  the  papers   in  it,  and

    the  editorial  staff   of    Anthropocene  –  Rashika  Venkataraman,

    Timothy   Horscroft,  and  especially  editor  Anne  Chin   –  for  their

    help   in  shepherding   the  papers   and  volume   through   the

    submission,  review,  revision,  and  production   process.  We  dedicate

    the  volume  to  Paul   Crutzen,   who  has  done   more   than   anyone   to

    bring  the  Anthropocene   and  human   domination   of   Earth’s   systems

    to  the  attention  of   both   scholars   and  the  general  public.

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