500 Mango Trees, 40 Years Old: Can They Earn Carbon Credits?

Almost never, and it helps to know who is paying. A big company somewhere has to cut its pollution and cannot cut enough inside its own factory, so it pays a farmer to hold carbon in trees or soil instead. That payment is the carbon credit. The company only pays for carbon that gets stored because of its money. A 40-year-old mango tree took its carbon out of the air long ago and will keep standing whether or not any company pays. Nothing changes, so there is nothing to buy. Your old trees count as the starting point that any new gain is measured against, not as the gain itself. The rules for tree projects are written for planting new trees, and one of the biggest rulebooks says the land must have had no trees on it for at least ten years before a project can start.

From the old trees, nothing. But the sum is still worth seeing. Five hundred mango trees usually cover about three to seven hectares, so call it five. Indian studies on grown-up tree systems report around nine tonnes of carbon dioxide per hectare in a year. If this were new planting, five hectares would give about 45 tonnes a year. At today's price of ₹700 to ₹1,300 per credit that is roughly ₹30,000 to ₹60,000 a year, before anybody's costs are taken out. An outside inspector has to check the project every single year, and that check alone costs much more than this. So even in the best case, a small orchard cannot run a project on its own.

No. Do not do this for carbon money. When a big tree is cut, the carbon inside it goes back into the air. You would start with a big loss and then spend twenty years just getting back to where you were. If your orchard has genuinely finished its useful life and you were going to replant anyway, that is the right time to plan the carbon side before you plant. But the reason to replant should be your fruit business — poor yield, disease, or the market — never the hope of a credit.

Three things are real. First, planting trees you did not have before: filling the empty gaps in your orchard, planting along the field boundary or bund, or putting trees on a patch of poor land. Second, building carbon in the soil under your trees by using mulch, growing a cover crop between the rows, and adding compost. This does count, but on a few hectares the amount is small. Third, and the most useful one, join a bigger project that somebody else has already registered — an FPO, a cooperative or a company. Then you do not carry the yearly inspection cost alone.

Treat it as a warning. Offering to register trees that are already standing means the person either does not know the rule that credits only pay for something extra, or is hoping you do not know it. Ask one question first: which registry is this project registered with, and what is its project number? Verra and Gold Standard both put every project on a public list, so a real project can always give you a number you can check yourself. Then ask what your share is, when you get paid, and whether you have to pay anything now. A real project pays you. It does not charge you to join.

They are not useless, they just do not earn credits. If you plant new trees on the same land later, your old trees are counted as the starting point that the new gain is measured against, and a good project will measure them properly rather than ignore them. There is also a safety reason to keep them. A project can make you promise to keep your existing trees standing, and if you cut them while the agreement is running, they can ask for the money back. So keep a simple record: how many trees, how far apart, roughly how old, and a few photographs. It costs nothing and it protects you later.