Listen • 3:56 As of early February, Iowa farmer Kelly Garrett has made about 115,000 off of the carbon that his plants remove from the air. There’s been a lot of hype around how farmers can make money from selling the carbon their plants naturally remove from the air, but there are still questions about how much of a difference these markets can make in reducing greenhouse gases. Kelly Garrett is experimenting with carbon markets on his farm in western Iowa’s Crawford County. As of early February, he’s made $115,000. Most of that money came from Canadian e-commerce giant Shopify, which bought 5,000 carbon credits from Garrett.