Sounds like a business opportunity. You get customers to pay for the planting of 500 trees at $X/tree. This is treated as a long-term investment. 30 years late

Sounds like a business opportunity. You get customers to pay for the planting of 500 trees at $X/tree. This is treated as a long-term investment. 30 years later the trees are harvested and the "investors" get back X% of the value of the trees. So they get to say they live a carbon-neutral life, and as a bonus, get to make some money.