He does a good job underlining the reality that while climate change does concern the environment, it concerns a lot more than that:
"I'm not saying that climate change isn't a major threat to the current biosphere (it definitely is), nor am I saying that other species don't have moral worth, but the point is that there is not some kind of easy trade-off between humanity and nature. When we dammed Glen Canyon to create Lake Powell, it was a monstrous crime against all that is sacred, but we humans continued to live our lives largely without disruption. Climate change, on the other hand, is a direct, existential threat to the biosphere AND all of human civilization. It's just too big to fit into something like environmentalism."