My point is, see it as a donation, not an investment. You probably won't get richer by funding carbon capture, but you also won't get richer from having your name on a building on the Stanford campus.

Take a look at the current carbon capture tech and the potential carbon capture rates from existing technologies. We are orders of magnitudes off from what is needed. You will require a fusion (something Gates is already invested in) level advance to achieve meaningful carbon capture. 1B isn't nearly enough.

Ok, 1B isn't going to go very far there, but that's why I mentioned the Gates Foundation. That sort of money (50B+) could get us somewhere, and might inspire guys like John Doerr to chip in some more as well.