While they’re growing, Real trees absorb carbon dioxide and other gases and emit fresh oxygen. They are grown on farms just like any crop. Christmas tree farmers plant new seedlings every spring to replace those harvested. There are about 350 million conifer trees growing on Christmas tree farms in the U.S. alone. These trees would not exist if not planted by Christmas tree farmers. Christmas Trees farms stabilize the soil, protect water supplies and support complex eco-systems. And of course, farm-grown Christmas trees can be recycled; artificial trees clutter landfills for decades.