the need for an accelerated protein transition · 2020. 2. 10. · population bomb • green...
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The Need for an Accelerated Protein Transition
Protein2Food MeetingJan 29th 2020
Charles GodfrayOxford Martin School
University of Oxford
• Food system challenges?
• Can we feed the world within
“planetary boundaries”
• Alternative proteins
This talk
The three waves of Malthusian pessimism
• 1790s; Malthus Essay on the Principle of
Population
• Industrial Revolution
• 1960’s & 70’s; Limits to Growth, Population Bomb
• Green Revolution
• From 2008; The Perfect Storm
• ??
UN Population Division, World Population Prospects, 2015 Revision
Billionpeople
Estimate with95 & 80%confidencelimits
ForecastData
Future population growth(medium fecundity assumption)
Now
2050
2100
23% chanceof peakbefore 2100
Alexandratos, N. & Bruinsma, J. World Agriculture Towards 2030/2050. FAO, 2012.
Current regional and projected global meat consumption
Coming challenge
• Continuing demand growth
• Urbanisation & mega-cities
• Hunger & under-nutrition +
Obesity & over-nutrition
• Pressures on agriculture
• Water scarcity
• Competition for land and soil degradation
• More frequent shocks
• Climate change
• Geopolitical
Can we feed the worldwithin planetary
boundaries?
• Planetary boundaries & the Lancet
Commission
• What food types challenge boundaries?
• What sets of solution maintain safe
operating space?
Nature (2018): 562, 519
Cropmodel
Water usemodel
Economicmodel
Healthoutcomes
Environ.outcomes
Economicconsequences
Emissionscenarios
Climate models
Populationscenarios
Socioecon.scenariosDiets
Modelling StrategyLed by Marco Springmann (Ox)
Oxford & International Food Policy
Research Institute, DC
Planetary boundaries
Johan
Rockström
Percentage contributions of different sectors to total agricultural greenhouse emissions
Meat alternatives
Marco Springmann & Report for World Economic Forum
100604020Now 80
Cooling
effect
Years into the future
CO2
Methane
• Calculation: John Lynch
Cooling consequence of not emitting different greenhouse gasses now
• Reducing methane critical to meeting
targets in next few decades
• Don’t trade-off CO2 for methane
Warming impact for perpetual consumption at high rates (250 Mt per year) for beef cattle and cultured meat production systems
Lynch & Pierrehumbert Front. Sustain. Food Syst. 2019
High Sodium
High red meat
Low milk
High processed meat
Global Burden of
Disease Study 2019
Tong et al European Heart Journal 2019
Analysis of diet and stroke in 418,239 people in EPIC cohort
Alex Sexton and Report for World Economic Forum
Alex Sexton and Report for World Economic Forum
The three waves of Malthusian pessimism
• 1790s; Malthus Essay on the Principle of
Population
• Industrial Revolution
• 1960’s & 70’s; Limits to Growth, Population Bomb
• Green Revolution
• From 2008; The Perfect Storm
• Double-green Supply+Demand Side Revolution