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.
Hey jackass, people aren't apathetic because they believe it's too late to do anything. People are apathetic because people like you haven't done anything and now it's too late. The "beneficial actions" you are calling for are half measures that won't help at all, and the people who care are already doing what they can while the real polluters, the real destroyers of humanity, are building bunkers and hoarding gold to survive the coming storm.