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Food Security Challenges Food Security Challenges in a rapidly changing worldin a rapidly changing world
Colin Chartres and Aditya Sood Colin Chartres and Aditya Sood
International Water Management InstituteInternational Water Management Institute
(Acknowledgements to Jan Lundqvist, SIWI)(Acknowledgements to Jan Lundqvist, SIWI)
Water for a food‐secure world
Contents
• Drivers of food and water scarcity• Scenarios of food and water demands• A changing planet• A global paradox and a challenge• Can we adapt and deliver food security
Water for a food‐secure world
Demography, GDP and Water Withdrawals1900 ‐ 2000
• Population increase about 3.6 times • Water withdrawals increased 6.8 times• GDP increased 19 times , about 3% per year (constant prices, IMF)
Water for a food‐secure world Data: CIESEN
Population hot spots
Pop increase 2000‐2010
Key increases/decreases in 1000s
Water for a food‐secure world
Land and water availability are reducing
Land area (ha) per person Water availabilty 1000m3 per person
Water scarcityPhysical scarcity: Water resources development approaching or exceeding sustainable limits
Economic Scarcity:Water resources can meet needs; but human, institutional and financial capital lacking to actually harness and use these resources
Source: Water for Food, Water for Life, IWMI, 2007
Water for a food‐secure world
Drivers of Food and Water scarcity
The major drivers of water scarcity and food security are:
– Population growth (7.0 b today to 9.0 b in 2050)– Dietary change– Urbanisation– Globalisation– Biofuel production– Climate Change
Water for a food‐secure world
0
20
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60
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10 100 1000 10000 100000
GDP per capita (2000 constant dollars per year)
me
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Meat China
India
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2 0
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1 0 0
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1 0 1 0 0 1 0 0 0 1 0 0 0 0 1 0 0 0 0 0
G D P p e r c a p ita (2 0 0 0 c o n s ta n t d o lla r s p e r ye a r )
milk
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Milk
China
India USA
USA
Consumption and income 1961‐2000
These trends are continuing
Water for a food‐secure world
Specific challenges to wheat in South Asia• Wheat in developing countries most strongly affected by climate change
• 2025: USD 15‐20 billion losses pa (12–16%)
• 2050: USD 32‐48 billion losses pa (20–30%)
• 10% Yield potential loss for every C0 increase
Courtesy Dr M Banziger, CIMMYT
Water for a food‐secure world
Issue identification: Water supply vs. demand gaps
Water for a food‐secure world
Drivers paint a pessimistic picture
• However, population and GDP dynamics are changing
Water for a food‐secure world
Global Water Withdrawals: historical and projected (after Peter Gleick)
Water for a food‐secure world
Slowing down of demographic dynamics
Water for a food‐secure world
A new economic world map
Water for a food‐secure world
Scenarios considered• Used the Watersim Model• Three scenarios:
– Business as usual (medium pop growth, medium GDP growth)
– Optimistic (low pop growth, high GDP growth)– Pessimistic (high pop growth, low GDP growth)
Water for a food‐secure world
Consumptive water demand (regions)2010 – 2050
BAU, Optimistic and Pessimistic
Water for a food‐secure world
Consumptive water demand (sector)2010 – 2050
BAU, Optimistic and Pessimistic
Water for a food‐secure world
Approx. 2000 water withdrawals
Water for a food‐secure world
Based on WaterSim analysis for the Comprehensive Assessment of Water Management in Agriculture
Comprehensive Assessment Scenario: Policies for productivity gains, upgrading rainfed areas, revitalized irrigation & trade
Water for a food‐secure world
The Global Paradox and Challenge
Feeding c.2 billion more people with
less
water for agriculture than we have now
in
an era of climate change
Water for a food‐secure world
BAU or a Healthy, Water Saving 2050?kcal meat (daily, gram)
1. Current food supply:(average global level; FAO) 2,800 224 (OECD)
‐ 1 billion undernourished, 1.4 billion+ overweight & obese; ~ 50% of production lost & wasted; high water, environmental & financial cost
2. Projected food supply (2050) 3,130 283 (OECD)(average global)‐ increase production by 70%; undernourishment/overeating/waste?‐ augmented water, environmental & financial cost
3. International norm (supply at national level) 2,700
3. A health recommended diet scenario intake (at individual level) 2,000 90
4. Reducing losses and waste by 50% ‐ equivalent to a rise in output of 15 – 25%‐ 50% reduction of losses & waste: potential savings of 1,350 km3
Water for a food‐secure world
CC may reduce potential yields in SSA and SA by 30% by 2030 (Lobell et al, Science, 2008)
Temperature increase may reduce yields of corn, soya beans and cotton by 30 – 46% in the US in a century(Schlenker & Roberts, PNAS, 2009)
Food production to increase by 70% by 2050 World Food Summit, Rome, November 2009. Similar: World Bank (2008), N. Borlaug (2002), etc.
Additional water required: + 5,500 km3 (FAO) from where?
Water Prudence/Saving BAU Supply chain logistics; - storage, transport & market access
Demand side issues, food intake;- Cf. definition on food security
Food waste, EU27: 179 kg/cap, year (2010)
Solutions BAU or Water prudence
Water for a food‐secure world
What does all this mean in terms of transboundary water issues?
• SE and E Asia has both opportunities and challenges• It has some areas where water resources are scarce and other where there are opportunities for development (e.g. NE Thailand vs Laos and Cambodia)
• The Greater Mekong area has potential to further develop as a food bowl for Asia –trade is vital
• However, the nexus issues of energy demand vs irrigation demand need to be worked through in terms of win‐win solutions
• Improved transboundary understanding is vital to the food‐enegry‐environment nexus. Better data and information will be critical to decision making
Water for a food‐secure world
Thank You