Reducing the severity of climate change (we've already signed up for potentially civilization destroying consequences, even if we could go zero emissions today), requires keeping proven reserves in the ground. No amount of "green" energy will impact our future if it doesn't mean we start using less fossil fuels (globally) than today.

Darkly, a disastrous global nuclear war that sends us back in time 500 years would be the most effective and most probable way of achieving this.