agroforestry agriculture evergreen agriculture agroecology food security climate change icraf regreening africa africa malnutrition mali sahel agriculture and forestry niger euraf eu european union europe fmnr alley cropping sylvopasture unfccc unccd land degradation ecology world agroforestry centre kenya water cycle burkina ethiopia rainfall caux dialogues uganda rain trees security health nutrient vitamin nutrition food and agriculture organization agra nollet wallonie électricité education instability fertilizer extremism zinder malawi famine famine solution cgiar zambia
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