Just. Tax. Carbon emissions. This will have the biggest impact toward solving this problem and industries will figure out the best way to reduce emissions all on their own. Have scientists come up with a dollar amount of damage a given volume of carbon emissions causes. This is the negative externality of those emissions. Then tax emissions at that rate. Problem (mostly) solved.
Can you imagine how depressing it must be if, in ten years, you're still alive to witness the climate changing and the world ending? You survived 10 more years, only to die with the rest of the world. Goddammit.