They are not giving new argument (and it's mostly the same person) they are making the same claims that are not being backed up (i.e. scientifically demonstrated).

We can speculate all we want that means nothing.

With regards to doing something about "it" what demonstrated consequences of climate change is it you mean we don't know how to deal with? I never claimed we shouldn't deal with it, just that it's neither existential nor something we can't handle.