The whole thing makes me so completely depressed. I am glad I don't have kids or else I would be too stressed out to function worrying about their lack of futures due to massive climate change.
I have a lot of millenarianists in my family who think of the chaos today as being signs of the "end times". I can't really buy into that, given that we're not in a crisis of WWII-level carnage. The fact that a human being today is far less likely than ever before to die a violent death is absolutely remarkable.
On the other hand, humananity is quickly evolving more ways of plausibly extinguishing or crippling itself, either by action of a small number of humans or prisoner's dilemma-like failure of large numbers of human to cooperate. Nuclear weapons were first, but it will soon be joined by other technologies.
What's depressing to me is that we're clearly not evolving the means to manage our power, wasting that energy on extremely petty concerns, instead. In fact, we seem to be moving backwards.
Can we kill all life on the planet? Certainly not. But we could make the long-term carrying capacity for humans so low that we'd enter terminal decline. So maybe "killing the earth" isn't precisely true, but what's the difference if there's no one around to understand the distinction?