The rainforest can be described as a thick and very tall jungle. The term rain comes from the great quantity of water that these forests get throughout the year. The rainforests are the world’s greatest natural resources. They are called the lungs of our planet. Half of all the kinds of plants and animals that exist on the planet live in the rainforests. Unfortunately, the area with rainforests is being reduced due to global warming. 100 years ago, the rainforests covered 14 per cent of the earth’s surface. Now, it is only 6 per cent. Scientists say that if the process continues at this rate, the rainforests will have disappeared in 40 years.