Substantial gains in agricultural productivity over the past 50 years have reduced rates of hunger and malnutrition, improved the health and livelihoods of many millions of people and stimulated economic growth in numerous countries. World cereal production has more than doubled since 1961 with average yields per hectare increasing around 150% in many high and low income countries, with the exception of most nations in sub-Saharan Africa.
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From collection: IAASTD - International assessment of agricultural science and technology for development
IAASTD/Ketill Berger, UNEP/GRID-Arendal