Increasing the Earth’s forests by an area the size of the United States would cut atmospheric carbon dioxide 25 percent.
Trees—all plants, in fact—use the energy of sunlight, and through the process of photosynthesis they take carbon dioxide (CO2) from the air and water from the ground. In the process of converting it into wood they release oxygen into the air. In addition to the CO2 that trees capture, they also help soil capture significant amounts of carbon.
Climate change isn’t humanity’s only global environmental challenge. Earlier this year a landmark UN global assessment warned that one million species are at risk of extinction, threatening the very foundations of our economies, livelihoods, food security, health, and quality of life.
“Anyone can plant a tree and we can start doing it tomorrow. Reforestation can buy us time to cut our carbon emissions,” says Bastin.
Source : nationalgeographic.com