Earlier quoted context omitted.
Governments are the only people who can enact laws to move large numbers of people as a group to act.
Well that certainty is what I am challenging. And your response is precisely the problem - people think only government can solve this. But government has not, will not and cannot solve it. We need to move beyond government as the solution. The first step in that is to loosen up your certainty that only via government can anything large scale happen.
The first issue is that everyone else thinks only government can solve this. If you say governments can't, but have no other solution, you're essentially saying "no-one can do this." Which, while depressing, isn't going to achieve much.
The second issue is that, clearly, governments could actually fix this. They most likely aren't going to. But the capital and human investments needed aren't impossible. It's not like a neolithic tribe building a computer for example. Resolving global warming is actually possible with our current resources and technology.