Almost all carbon credits are a scam.
There is an answer: just tax CO2 emissions. Like, a lot. The problem is that it will take a foundational shift in US politics for that to be an acceptable answer, and we don't have time (negative time more or less) to do that. And so, a whole fuck of a lot of people are going to die and a fuck of a lot of the planet is going to become unlivable. Like, not that long from now.