Why do naturalists suggest that we plant more trees?

The answer is so we have more oxygen and because loggers are cutting down more trees every day and the more they cut the less air we have

Ground up wood is used to make paper for magazines, newspapers, candy wrappers, and cereal boxes. Sap, the liquid that flows in trees, is used to make maple syrup, chewing gum, crayons, paint, and soap. Dyes and medicines are made from the bark, while leaves and roots provide oils for cosmetics and medicines.
and it also helps us and animals as well

Ibelieve the answer is b. dugout