Why Earth's largest rainforest is being destroyed The world's rainforests do many vital things, from providing habitat for millions of species to regulating the world's climate and rainfall patterns that we all depend upon.  By far the world's largest rainforest, the Amazon, is under threat of deforestation and degradation from human activities.  If we ignore what's happening there, we risk not only a regional loss but a change in the global climate system. The Amazon rainfor