Deforestation causes global warming. Trees absorb carbon dioxide and use it to grow. But when the trees died or been cut. Carbon dioxide will be released again. For this reason, deforestation has caused more damage to 2 times. Because different types of greenhouse gases has been released. At the same time. And the number of trees absorb carbon dioxide is reduced. 30% increase in carbon dioxide in the atmosphere 150 years ago, is expected to come from deforestation.