First, we are NOT going to kill the planet. Just look at what the planet has been thorugh before:
Cretaceous-Ternary extinction: This is when the dinosaurs died off from a meteor impact and lava flows.
Permian Triassic extinction: about 98% of all life in the ocean went extinct.
There were inland seas in the central US at times.
There are others. But the point is that the *planet* and *life* bounced back from all of these extinction events. Sometimes it took a million years or two, but the planet didn't die. And life continued.
So, saying that we are killing the planet is simply hyperbole.
What we *are* doing is causing another extinction event. And, humans have been doing that for at least 10,000 years when we contributed to the extinctions at the end of the last ice age. We *are* changing the climate in a way that will cause sea level rise. And *that* is making it very uncomfortable for our cities on the coasts.
We are contributing to events that are going to have severe economic impact in ways that will harm billions of people. We are contributing to one of the great extinction events of the history of the Earth.
We might even manage to kill ourselves off.
But if we do, the planet and life will bounce back and in a couple of million years, things will be back to some type of 'normal' without us.