And if you’re concerned about climate change, hemp could completely replace the timber industry model of growing a forest for 20 years, cut it down and convert those wood pulp fibers into paper, cardboard and toilet paper. Trees could be left unharvested, so they can lock up greater amounts of carbon dioxide as they get older and bigger. An acre of hemp creates the same amount of fiber as four acres of trees, in one growing season, as opposed to 20.