Rising atmospheric concentrations of greenhouse gases are expected to affect food security through their impacts, both positive and negative, on agricultural productivity (FAO, 2003a). Impacts are generated through four mechanisms: CO2 fertilization, climate change, extreme weather events, and rising sea level. Agricultural production, a requirement for food security, also emits greenhouse gases. Emissions associated with land-use change and land degradation are particularly important in low-income, food-insecure countries.
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