The document summarizes the causes and effects of deforestation. It notes that around 11,000 years ago, 60% of the Earth was covered in forests but now only 1/5 remains due to clearing for various uses. Deforestation results in damage to habitats and biodiversity loss. It disrupts the water cycle and causes issues like soil erosion, flooding, and drought. Large amounts of carbon dioxide are also released into the atmosphere from burned or rotting trees. Reforestation efforts are needed to mitigate the effects of deforestation.