Dal convegno "Doppia Piramide: alimentazione sana per le persone, sostenibile per il pianeta" - 29 giugno 2010, Milano. Rethinking food production within planetary boundaries - Gianfranco Bologna

1. Milano, 29 giugno 2010 Rethinking Food Production Within Planetary Boundaries Gianfranco Bologna Scientific Director and Head Sustainability and Education WWF Italy

4. WATER SHORTAGES Between 1950 and 2000, world water use tripled Some 70% of water use is for irrigation Overextraction is leading to disappearing lakes and rivers failing to reach the sea Aquifer depletion is causing water tables to fall and wells to go dry 175 million Indians, 130 million Chinese are fed with grain produced by overpumping Since the overpumping of aquifers is occurring in many countries more or less simultaneously, the depletion of aquifers and the resulting harvest cutbacks could come at roughly the same time, creating potentially unmanageable food scarcity. Photo Credit: Yann Arthus-Bertrand

9. Climate Change < 350 ppm CO 2 < 1W m 2 (350 – 500 ppm CO 2 ; 1-1.5 W m 2 ) Ozone depletion < 5 % of Pre-Industrial 290 DU (5 - 10%) Global Freshwater Use <4000 km 3 /yr (4000 – 6000 km 3 /yr) Rate of Biodiversity Loss < 10 E/MSY (< 10 - < 1000 E/MSY) Biogeochemical loading: Global N & P Cycles Limit industrial fixation of N 2 to 35 Tg N yr -1 (25 % of natural fixation) (25%-35%) P < 10× natural weathering inflow to Oceans (10× – 100×) Atmospheric Aerosol Loading To be determined Land System Change ≤ 15 % of land under crops (15-20%) Chemical Pollution Plastics, Endocrine Desruptors, Nuclear Waste Emitted globally To be determined Planetary Boundaries