@Felix-G Thanks for reading!
I think you touch on the key frustration here, which is that climate change is a global problem, but it feels near impossible to imagine global alignment and follow through on the decisive actions required. The Paris climate accords are a good model of legally binding action - but most agree the targets were not nearly aggressive enough, and even, then, many countries have fallen behind their goal - see Australia trying to engage in creative emissions accounting to hit their target.
There's a lot more hope at the regional level. For example, in Canada, British Columbia's carbon tax blazed a trail for the eventual national adoption of the tax. Lots to argue about in terms of implementation and whether it goes far enough fast enough, but I think it shows that "overachieving" in a locality can have national, even global consequences. The jurisdictions that decarbonize fastest will act as the model for others to follow. The longer Canada has a carbon tax, the easier it will be for other political parties in other countries to point to it as an example that can be adopted locally.
Ultimately, I think global agreements will lag individual states and cities. If your area is driven almost entirely by renewable energy - great! What other parts of the climate puzzle can be addressed in your local area? Electric vehicle incentives? Prodding local industries to decarbonize? Protecting forests? There are some interesting global alliances of cities trying to get ahead of the curve with respect to climate - for example, https://www.c40.org