This document discusses deforestation around the world. It notes that forests currently cover 31% of the land but are being lost at a rate of 46-58 thousand square miles per year, equivalent to 36 football fields per minute. Deforestation is a major threat in tropical rainforests, which contain much of the world's biodiversity. For example, 17% of the Amazon rainforest has been lost in the last 50 years mostly due to cattle ranching and agriculture. Deforestation in the Amazon increased 28% from 2012 to 2013, with over 5,800 square km of forest destroyed. The document lists some of the key causes of deforestation as illegal logging, fires, and fuelwood harvesting.