Geographers say that an even distribution of forests over 30 percent of a country's land can stabilize climate and reduce the occurrence of droughts and floods so as to provide a solid basis for agricultural development.
根據世界糧農組織的研究，一般說來，一個國家若有百分之卅的土地為森林覆蓋，且分佈均勻，就能調節氣候、減少自然災害，使農業穩定發展。