Over (human) population and domesticated animal proliferation is what's going to kill us.
The amount of sunshine that hits the earth is our total energy allowance and it's not enough.
We have been making up the shortfall by drawing on the stored ancient energy of fossils-plant and animal.
This is running out and in the meantime its by-product Co2 is killing the planet.
Chomsky has called the Republican Party of America "the most dangerous organisation on the planet" because of it's denial of the impending catastrophe and it's policies that are in fact bringing the end nearer.
It's a big surprise to all that China is doing a lot to save us now whereas "the most dangrouse organisation on earth" in this regard controls the totality of power in America and thus can destroy everything with impunity.