At the scale we've hit, I fail to see how anyone except billionaires, mega corps and investment funds can solve this problem. The economic incentives aren't there yet without pumping billions of dollars into the problem without a financial return.
Governments have clearly failed, and several corporations have won their plays to become more rich and influential anyway in many countries.
I don't doubt that humans will continue to survive on this planet if all the worst predictions come true. Many other species won't be so lucky, which is a shame. We have all the technology and power to be caretakers for our home but we just trash it anyway.