Yes, natural and anthropogenic reforestation of the rainforests would mitigate global warming. By allowing plant growth to prosper rather than deforesting it, carbon can be sequestered rather than released. Yet, the problem lies when land where once-pristine rainforest grew is now unsuitable for growth. Rainforest soils are notoriously fragile, due to the fact the decomposition and nutrient re-uptake are very efficient processes. Without natural vegetation cover, nutrients can leach from the soils. Sometimes, the ground is converted into a hard substance where plants cannot grow. When possible, planting trees is a great way to combat global warming.
Protecting rainforests and allowing them to regrow would help to decrease the amount of carbon dioxide in the atmosphere. While carbon dioxide warms our atmosphere enough to enable humans and other species to survive on Earth, increased levels of carbon keep more heat trapped in the atmosphere. Because Venus has so much carbon dioxide in its atmosphere, the planet is hotter than Mercury, despite Venus being almost double the distance from the sun.
Rainforests have extremely dense vegetative growth per land area, which means that they are some of the most efficient ecosystems at sequestering carbon dioxide. In addition, rainforest ecosystems have some of the great species diversity.
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