Well, let me start by saying I am not a global warming denier. It's obviously a phenomenon we should be worried about. I am
somewhat skeptical about just how much impact human beings have on climate change. I am
extremely skeptical about government's ability to fix this problem. I am terrified they are going to do us great harm while doing nothing to fix it. There have been several global climate initiatives*, and none of them seem to have gone well.
I think a carbon tax is better than many of the alternatives I have heard. I don't like the idea of our government giving up sovereignty and pledging to the UN, or whatever, that we will hit a mark. I prefer we handle everything domestically and we lead the way in that regard. We could even offer to lower tariffs on goods from nations who pollute less.
How would they determine the tax? Are they trying to predict how high it needs to be to restrict emissions to a certain level, or is it a tax based on the estimated economic cost of the pollution?
Say the government can somehow fairly set and assess the tax, it works amazingly, and it does lower emissions while only slightly depressing industry...how do you know you didn't push activity towards more harmful alternatives? There are always unintended consequences to worry about. There are too many factors at play. It just seems like a pipe dream that this sort of plan will work. There may be a great government solution to improving this issue, but it's probably not one of the same old solutions (tax, ban, subsidize, etc.).
*
https://reason.com/archives/2015/12/14/a-happy-agreement-in-paris-wont-fix-glob