Trees planted today grow more than three times as fast as their ancestors. It might sound strange to claim carbon credits for trees that you plan to chop down and turn into toilet paper or chairs. What’s more, because the timber is constantly being tracked, the carbon is easy to measure, solving a key problem with carbon credits. Eucalyptus can be planted immediately, with great speed, and the first carbon credits are issued in just a few years. A 2019 analysis published in Nature found that 45% of carbon removal projects the researchers studied worldwide involved single-species tree farms.