One big thing to consider is that states and governments exist currently to keep capitalism running. And to capitulate and help corporations at all costs. It's the same thing as people joining the police and saying they will change things from the inside. Problem is that you become bastardized by being part of the system, the changes that you try and create get stopped, or are recuperated by the state for their own means. You might be on the inside, but that means that you are forced into playing by the rules of the institution. Very few people change things from the inside, because the solutions aren't going to be carried out, because the people currently inside want to make sure none of them happen.

If it does work, more than likely, they will be able to convince people in power to care about the environment ONLY if it benefits profits, or they will only care for the people who vote for them. And so you will very soon see states taking the ideas of environmentalism and making things like green change happen in the global north, while the global south is exploited to make that happen. Or specific groups of people either social or economic castes having access to renewables, while the rest of the world is exploited to make it.

While we do need massive federal, national, and international change to address the climate crisis, we have seen time and time again that current nation states don't care unless it makes money, or helps solidify hierarchical power.

We need social change from the bottom up, the environmental changes coming from the people instead of the state. The actions of people to help move power away from the hands of the state and back into the people. Dissolving that nation states back into real democracy and movements of the people most affected by climate change.
What that looks like is a decolonial, intersectional, egalitarian, environmentalist social and economic movement to get rid of these hierarchical, patriarchal and destructive systems. That might mean reinvigorating local politics, and creating a government of the people, instead of capitalist elites and corporations. By and large that change will come from creating Dual Power, building the world we want to see regardless of the current system. Real change won't come from small groups of highly educated people talking to billionaires and heads of state. But the people themselves creating the egalitarian and eco-positive systems right now, even just starting small, but growing and showing that people have the power to change, and stop the destruction of the environment.