How do rainforests affect the Earth's climate?

Affects on the climate on the tropical rainforest could be annual rainfall, so how much it rains. Also the amount of sunlight available to the rainforest. Seeing that there are many trees in the tropical rainforest, as well as many other rainforests there is not that much sunlight available. The tropical rainforest is very dry and warm. There may be volcanoes around some rainforests like the one in Costa Rica has a volcanoe over looking it. Hope this helps(: