Sky Harvest creates and sells carbon credits to offset greenhouse gas emissions by paying disadvantaged timberland operators in the United States not to harvest timber they would otherwise cut. In a market fraught with growing pains, Sky Harvest introduces a novel, more comprehensive framework for measuring carbon, which accounts for time: how long carbon is stored and when it is stored. Remarkably, Sky Harvest is the only developer thinking this way. Sky Harvest's carbon credits properly and completely offset the negative climate impact of emissions elsewhere.