Rainforest play a major role in cooling the earth.

Rainforest play a major role in cooling the earth because-

1. Dense forest has a direct effect on the temperature of that area. 

2. In moist tropical region there is dense forest growth, they form canopy. The broad leaves of the forest help to trap moisture and allow it to evaporate, so there is natural cooling effect. 

3. When these forests are slashed and burnt over large area, hot and dry air spreads and the temperature of the area increases. 

4. When forests are burnt, large amount of carbon dioxide is added to the atmosphere and there is air pollution, which also leads to global warming.

5. Heavy deforestation leads to decrease in the rainfall of that area and changes in rainfall pattern are observed.