據UNEP及聯合國貿易及發展會議（United Nations Conference on Trade and Development，UNCTAD）在2008年底公佈針對非洲24個鄉鎮114個小面積農場調查，結果發現使用有機或是附近使用有機耕作的田地產獲增加一倍，東非產獲更高達128%。
Over half of the food produced globally is lost, wasted or discarded as a result of inefficiency in the human-managed food chain, finds a new study by the United Nations Environment Programme released today.
The UN report was issued at the UNEP Governing Council and Global Ministerial Environment Forum taking place in Nairobi through Friday. The environment ministers are focused on finding solutions to the world's environmental, financial, food and energy crises through the emerging concept of a green economy.
"There is evidence within the report that the world could feed the entire projected population growth alone by becoming more efficient while also ensuring the survival of wild animals, birds and fish on this planet," said UNEP Executive Director Achim Steiner.
The report points out that more than one-third of the world's cereals is being used as animal feed, and that percentage could rise to half by 2050, aggravating poverty and environmental degradation. Instead, the report suggests that recycling food wastes into animal feed and turning wastes such as straw and nutshells into cellulosic biofuels could reduce pressure on fertile lands and forest ecosystems. Yet, even if these steps are taken, up to 25 percent of the world's food production may become lost due to "environmental breakdowns" by 2050, the study finds.
The report warns that increased use of artificial fertilizers, pesticides, increased water use and cutting down of forests will result in a massive decline in biodiversity.
Already, nearly 80 percent of all endangered species are threatened due to agricultural expansion, and Europe has lost over 50 percent of its farmland birds during the last 25 years.
Organic food production is the one bright spot in this grim picture.
A recent report by UNEP and the UN Conference on Trade and Development surveyed 114 small-scale farms in 24 African countries, publishing their findings in late 2008. The survey found that yields had more than doubled where organic or near-organic practices had been used, with the yield jumping to 128 percent in east Africa.
Organic practices outperformed traditional methods and chemical-intensive conventional farming and also provided environmental benefits such as improved soil fertility, better retention of water and resistance to drought.