Why do naturalists suggest that we plant more trees?

Trees take in carbon dioxide and other gases that we cannot breathe in and gives us oxygen. It also helps other plants and animals nourish themselves. To some animals, trees are their habitat so by planting more trees, we are technically building a habitat for plants and animals to live in. It's also good shade on a sunny day.

D.haka is the first answer and a.canberra is the second answer