It doesn't have to solve it, just contribute to less carbon than we otherwise would have used which in turn reduces the future potential $$ and life cost.Bet there's a rationale for it! In other news carbon has apparently reached some sort of threshold in the atmosphere. Glad the carbon tax is going to solve that problem.
There are all kinds of scenarios where climate change is still horrible even with a carbon tax, just less horrible than it otherwise would be
The scenarios with largest potential future risk/highest cost damage are those with no carbon tax at all