The Amazon Rainforest covers over a billion acres and produces over 20% of the world's oxygen. It is estimated that over half of the world's plant and animal species live in rainforests. At least 80% of the world's diet originated in rainforests, including fruits, vegetables, spices and nuts. However, rainforests are being destroyed at an unsustainable rate, with one and a half acres lost every second, threatening millions of species with extinction.