Yeah you don't see one and you've been looking so hard and evaluating all the options. Here's a hint ANY option beats extinction.
Look up the "princeton wedges" concept. A combination of extant technologies and policies can stop us, right now, from the point of no return. It's not a technological question looking for a fix, it's a socio-political blockage on the part of American / Australian and UK conservatives all fueled by the denial industry which is funded by Exxon, the Koch brothers and the rest of the oil and gas industry.
BTW, each and every member of their boards might want to look over the Nuremberg trials to see what civilization DOES to people who think that 1) they're beyond the law or 2) since no law currently explicitly prevents them from doing what they're doing, they're forever beyond the reach of justice.
America will dissolve your assets. We'll seize your assets from your heirs and assignees. We'll nationalize your companies and plow the profits into doing whatever we need to do to survive. You're nothing,and America and her people are everything. In fact, you're less than nothing.
As for the mouthpieces of denial, the "think tanks" and "scientists" and PR firms don't kid yourselves. We'll hunt each and every one of you down to the ends of the earth, no matter how long it takes, no matter the cost. Rest assured the thoughts and beliefs you have which cause you to think that you'll never be brought to justice, because "you're entitled to your opinion" , because you "really believed it" because you still "really believe it", rest assured that all of that will be swept aside in a torrent of rage and justice seeking and that loophole in the law you think will save from justice will turniinto a noose just like it did at Nuremberg.
Hear my voice Exxon board? This is the first few faint strains of all that the future holds for you, your heirs, your power and your wealth, your influence and lifestyle. This is just the first tiniest brush stroke of what the future looks like for each of you personally. This is just the smallest , faintest sampling of THE RAGE.
Guess what happens when civilization starts to collapse first for a few small countries, then poor people in cities, then millions in larger cities and the countryside then tens of millions then billions of people? Guess what happens when you and the cock sucking sycophants you've populated Washington with *no longer hold any power* ? Guess that's pretty much a mere fiction , an impossibility to you.
The way Nuremberg was to that other group of mass murderers.
If I were a lawyer, PR agent, accountant , printer, developer, manager, or donation taker I'd start now , today to make pains to put on a VERY public display that you strongly disapprove the Koch - Exxon denial machine and YOU aren't taking money from them in ANY form. Yeah, I'd be thinking hard about whether I wanted to be associated however faintly, with the Great American Denial Machine. I'd be thinking about my future and what my family thinks of me, and what I was doing to them, in, and to you know, reality and the earth where they're going to have to spend the rest of their time.