The reason why today's rain forest is only part of it than there is in the past is because forests were destroyed by humans. Every day the vast rain forests destroyed, especially in the amazon and southeast asia, because the trees are felled and burned. Many forests are (forests that grow in the mild climate, there is no temperature or rainfall is very large) in Europe, North America, and asia many forests have been felled over the centuries for agriculture and housing, leaving only tropical rain forest as large wooded land last on earth, the forest clearing was carried out gradually, but now the rain forest can be cleaned at a frightening rate, with a chain saw, cutting down a tree can be done in a few minutes. Rain forest rich in plants and animals, many of which contained only within a narrow area of the forests, some scientists estimate that as many as one species every half-hour of extinction due to rain forest clearing.