We're all in. Only took one player to make the call (the industrialized west); now we see the cards.
We develop magic technology that can fix all this or we die.
I'm betting on the magic technology. You can go vote yourself into a economic depression, but given the current rates of information gathering, we will have the solutions shortly. In may ways, we have one staring us in the face - widespread adoption of nuclear power - but we're too stupid to implement it.
The great filter is the 10,000 or so odd nuclear warheads in the ground right now. It always has been and always will be. Those warheads will fly long before the planet warms up to extinct us.