They may work - assuming ‘global warming’ is a reality, and it is largely caused by humans. I find it hard to believe that computer models can accurately predict the weather centuries in advance, when they can’t even predict accurately the weather for next week.
Anyway, I won’t get into a ‘global warming’ discussion. But these ‘credits’ won’t solve the problem, if it exists. It would seem to be simply a money grab, perpetuated by people who prey on others gullibility and their desire to change the world with their money while not actually doing anything about the problem. I think it ranks up there with some of the mileage improver scams, and we all know what I think about those…