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.
It's not even that Gen Z doesn't care. Many of us just hit a point where everything feels numb. You can only get so upset/depressed/etc until your brain just kind of shuts down a bit.
There's grief over everything that we'll probably never get to see/have. There's grief over the backsliding of progress that actually seemed real to us at one point. There's grief over the many people who just die, everywhere, for terrible and avoidable reasons. There are many animals we will already never get to see.
Everywhere you look, people almost seem to feel pride in not knowing things. One member of Gen Z managed to have her voice heard about the planet, and she was ridiculed by grown adults. Multiple governments are now trying to decrease education, and some people somehow see that as a good thing. Wildfires are blazing like never before, the smoke is totally hazing new areas, yet people still refuse to see. Why is Gen Z expected to be the magical cure to global warming? People won't even listen to Greta! We're just as human as any other generation. Of course we'll try, but the focus on solving the climate problem should have already been happening generations ago. Just THINK of all the progress we could have already made!
Lucky us, huh? We're also regularly encouraged to shove all of these emotions down because we could not possibly have similar problems to older adults. Fuck that, respectfully.
Yeah, I've got to say, sometimes it's damn hard to have any hope.
I do think more of us need to vote, even if it only feels like there's a 3% chance that something actually changes for the better...