Which means that replanting trees is not enough to avert climate disaster. We need to stop the destruction of forests already here. Study after study indicates that only by preserving and protecting natural forests, rainforest in particular, can we slow down the earth warming. Deforestation is now one of the biggest sources of carbon dioxide, because when trees are cut down much of the carbon stored within them escapes into the air – especially if the wood is burned. And yet logging and clear-cutting has been on the rise in the Amazon — the world’s largest rainforest. New satellite images suggest areas larger than a soccer field are being cleared every minute.