Why it is important to retain some forests and to replant any that you cut down?

It is important to retain the forest because they hold the majority of the carbon and green house gasses that is on the earth today. It isn't as easy as replanted a forest there are native species that can't be replaced after we destroy their forest. Most of the species that get killed by deforestation are species only found in that forest. Stop deforestation, But you should still plant trees because the soak up carbon and green house gasses.