A critical analysis of data with dubious causality or very likely simple associative relationships will lead to a dubious conclusion. You cannot treat climate data like engineering data, a plane or devices either work or not when the test comes, but for climate testing a fix would take almost a lifetime to prove, and likely another lifetime to fix if the conclusions turn out to be wrong. Since we all live in the same planet, can we put ourselves at risk based on the judgment of a few? So the solution is a vote on whether the people who will suffer the consequences thinks its true or not.
I think, if its human caused a human solution can mitigate it, such as the effects of the ozone layer. If its not human caused, but a natural cycle of the earth, we are only worse off by spending money on it. But even if not man made, the effort and technology to correct it could eliminate or forestall a hot period in earth's natural cycle regardless, so in the end we will learn a process that could be used for future terraforming.