microsoft powerpoint - topic-6_ impact of human act_edit web view04-03-2015 · food...
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IMPACT OF HUMAN ACTIVITIES ON ENVIRONMENTAL QUALITY
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● Since Homo sapiens live on the planet of earth c.a.180,000 years ago,
human activities have been increased that cause great impacts to environment
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Major human cultural changes and its impact to environment
Human Cultural changes
Major human activities
Humans were mostly hunter gatherers
HuntingFood gathering
Agricultural revolution Settlement and agriculture development,
domestication of animal, city development (urbanization)
Industrial revolution Development of industrial process, mining and
fossil fuel production , increase the use of pesticide and chemical fertilizer,
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Information and globalization revolution
Rapid technology and information development, globalization on many aspects
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Agricultural revolution Settled Agriculture
● Nomadic hunting and food gatheringSettled agriculture (animal domestication and plants cultivation)
● Settled agriculture has increased food supply that led to support more people, but decrease the environment quality
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Human activities for settled agriculture and its impact to environmental
● Peoples Cut down vast forest to supply wood for fuel and building material€ soil erosion
● Plowed up large expanses of grassland to grow crops turning fertile land to desert
● Built irrigation systems to transfer water from one place to another€ continous avaibility of water for plants
Such activities cause extensive land clearing which degraded the quality of ecosystems
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Modern agriculture has harmful impacts on air, soil, water, and biodiversity resources
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Raising livestock to produce meat by open grazing could destroyed ecosystems
Lightly grazed
Overgrazed7
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City development and urbanization● Urbanization: the formation of
villages, town, and cities. Some villages grew into towns and cities, which served as center for trade, government and business
● Towns and cities concentrated sewage and other wastes, polluted the air and water
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Industrial revolution● Represented shift from
dependence on renewable energy wood to non- renewable
fossil fuels (first coal, later oil and natural gas) this led to switch from handmade goods in small scale production to large scale machine-made goods in industries cities
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Effects of extracting, processing and using of mineral / fossil fuels
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Using fossil fuels can leak into the ocean ecosystems● a large amount Liquid fossil fuels can
seeps into ocean◦Tanker accidents◦Waste oil dumped from activities on land
Oil spill onto the ocean and kill a number of organisms
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Spill of oil fossil fuel over the sea
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Surface and subsurface mining cause pollution and degradation of stream and groundwater by runoff of acids
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Burning fossil fuels produces billions tones of CO2, one of greenhouse gases that contribute
global warming climate changeProjected emissions of three important greenhouse gases as a result of human activities
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Several Impact of human activities cause a major issue:CLIMATE CHANGE
EFFECT of CLIMATE CHANGE to HUMAN HEALTH
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Building roads is one of human activities that cause destruction and degradation land and ecosystem
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Soil Degradation
Areas of degraded soil of the world
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Controlling pest population by spraying a pesticides
● About 2.5 million tonsof pesticides are use yearly in developed and developing countries to control pests such as insects
● The use of pesticides threat human health:
-According WHO, nearly 3 million agricultural workers in developing countries are seriously poisoned by pesticides each year, estimated 180,000 deaths-In developed country such as USA, 300,000 farms worker suffer from pesticides related illnesses each year
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Decline of marine species (mostly fish)
About 75% of the world’s commercial oceanic fish stocks are in decline
Overfishing
Pollution, habitat degradation 19
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Overload wastes into water cause degradation of water quality
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Water use● Only a tiny amount of world’s abundant water is
available as fresh water (2.6%)
● Water is collected, purified, recycled, distributed fresh water available
● Human withdraw fresh water from rivers, lakes, andaquifers for cities, residences and industry uses, andalso to irrigate cropland
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Global water use
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The use of too much water by human may effect to the avaibility of fresh water
● Due to large population, human withdraw underground water faster than it is replenished depletion of fresh water
● If it is happened near a coast, salt water can intrudes into aquifer and contaminate drinking water along coastal area
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Too much water: flooding● Natural flooding primarily caused by heavy rain and
degradation of water holding capacity of soil
● Natural flooding have benefits:- provide productive farmland- recharge groundwater- refill wetland
● However, each year flood kills thousands of people and cause property damage
● Since 1960 human activities have contributed a severe flood damage by:-removing water-absorbing vegetation (hillsides)-draining wetland that absorb floodwater-living on flood plain
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Flood Plain
Hillside
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Nuclear power● Produce energy: produce electricity at much lower cost than coal
● High-level radioactive wastes (stored in pool of water at plant site)
● Nuclear disaster happened at Ukraine (Chernobyl nuclear power plant) in 1986:- killed 3,576 ~ 32,000 people- a series of explosions caused a huge
radioactive d cloud spread over Ukraine, Russia and other parts of Europe
- forced 40,000 people to leave their homes, probably never to return
● Global nuclear power plant peaked in the 1990s and is projected to decline
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Information and globalization revolution● Technologies such as telephone,
radio, television, computers, the internet, remote sensing satellites providing people to access people to have much more information on a global scale
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Positive affect of information and globalization revolution● Allow us to respond environmental
problems more effectively and rapidly● Allow us to use remote sensing satellites to
survey resources and monitor changes in theworld’s forests, grassland, oceans, rivers, polarregions, cities, and other system
● Can reduce pollution and environmental degradation by substituting data for materials and energy and communication for transportation
● Allow environmental researchers and activist to exchange data and information rapidly
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Negative affect of information and globalization revolution● IT could cause confusion, distraction and
sense of hopelessness as rapidly growing environmental information
● Increase environmental degradation and decrease cultural diversity as a globalized economy spreads over most of the earth and homogenizes the world’s cultures including disease
● Creating and introducing new technologies much faster than we ca evaluate their impacts
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Infectious disease● Spread by air, water, food, body
fluids, some insects, and other nonhuman carrier (vector)
● Human activities such as International traveling can rapidly spread diseases such as flu, measles, chlorella, smallpox and AIDS
● Migration to uninhabited rural areas and deforestation in tropical country can expose to disease spread by vectors such as malaria
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Humans activities affected biodiversity
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Kill endangered animal cause depletion of biodiversity
Consume such protein endanger Confiscated products fromspecies of Gorilla endangered species
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