Unfortunately, as the number of people living on the Earth increases,rainforest are cut down rapidly to make for human development. This is a dangerous practice as major climatic and other environmental changes will occur which, in the long term, affect the existence of human, if rainforests continue to dissapear. Not only is the production of oxegen important, but also the diversity of plants and animals that live in the rainforests. Sine many of these plant are yet to be discovered by scientists, their contributions to the earth are not yet know. Environmentalists have suggested that some plants, which might be key to some lifesaving medicines, may all be destroyed before they could ever be found.