In short, we aren't on track to an apocalyptic extinction, and the new head is concerned that rhetoric that we are is making people apathetic and paralyzes them from making beneficial actions.
He makes it clear too that this doesn't mean things are perfectly fine. The world is becoming and will be more dangerous with respect to climate. We're going to still have serious problems to deal with. The problems just aren't insurmountable and extinction level.
oh look people in the comments who are missing the fucking point. I'm honestly so sick of this shit. You either have rainbows and unicorns and "we'll just figure it out"/climate deniers to "WE ARE ALL GOING TO DIE AAAAAAAHHHHHHHHH" apathetic fucks who won't do shit* because "what's the point we are all doomed anyway" which...causes the same problem as denying does.
honestly i've delt with more people who refuse to change anything because "what's the point" than I deal with outright deniers anymore.
*not sure if anyone in the comments is an apathetic "do nothing though tbf and honest. So there is my disclaimer don't @ me.