I find this post very strange. On the one hand you clearly hold in poor regard those who believe in some afterlife/heaven kind of concept and presumably the effort they do to try and secure a position in it and yet seem willing to put in an effort to prevent what also may be fantasy. In any case, the 20 year time frame is certainly fantasy. Certainly you can't believe that we're looking at near term end of humanity and yet haven't quite gone far enough that we cannot reverse it with some reasonable efforts. If we're that close to far gone there is nothing we can do. Or at least will do as there will never be agreement on what to do.
In non spiritual matters everything is ideally a measured risk. Your argument could equally be used to fund a worldwide $10Trillion/year effort in creating an anti-meteroid shield for the earth in case it's hit by some stray rocks.
What we have here, as always, is climate scientists modifying their predictions. Again, as they always have and always will do, for despite unbelievable arrogance they still don't have a clue how the world actually works, what is causing climate issues on a huge scale, what the climate will be like, and how it's going to affect us. They get an A+ for consistency, though, always dooming and glooming. You never hear about the positives of global warming. Ever, like it's an evil cancer and the world is better if colder.
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