Yep - we appreciate that you'd like hard-and-fast scientific proof that the proposals will have a meaningful effect on global warming.
However, I suspect that the ultimate truth is that we will never have absolute proof one way or the other, so surely the point is that if there is a decent chance that we should be making changes to help (as most scientists seem to believe), then it is surely worth pursuing.
If they are right, then we can't wait until every maverick scientist, lone dis-believer or consiparcy-theorist blogger is convinced before we do anything, because that will never happen!
To be honest - your OP actually comes across mainly as a complaint about having to pay taxes rather than truly being concerned with the science behind it (I'm guessing this is not the case with you, but I think that's how it will look to many).....and I do appreciate your concerns - there WILL be corrupt people profitting out of this for sure - but isn't that the case with pretty much everything these days?