Simplistically, if you take something like coal or oil, which has been stored, it takes a million years or whatever to create that, and it's stored deep underground so you're taking carbon that's been stored and then you're releasing that into the atmosphere. For that to become coal again, it takes another million years, plus or minus.
With a terrestrial carbon, something that's a crop, whether it's a forest or an agricultural crop, when you burn it and it emits the carbon, the CO2, you recapture that when the forest or the agricultural crop grows again, so it's a cycle. It's not perfectly carbon-neutral, because there are some fossil fuels that are used in processing and transporting to market, but we measure it when we're shipping to our customers overseas, say to power plants in Europe or Asia. In fact, it's been audited, and we figure that even when we account for all the transportation, rail, and all the harvesting, the electricity and the bunker fuel for shipping overseas, it's still 80% better than the fossil fuel alternative.