Nothing will change until developed rich countries are starting to hurt. And I don't think it's going to hurt enough in 10 or 20 years. The pain will come slowly, people won't see it. It's like going back to the middle age so slowly, that the population don't realize or feel it. And honestly, wars and trump are making climate concerns so difficult to think about.
The initial pain will be diffuse and not obviously caused by global warming. For example, destabilization of equatorial countries due to wet bulb temperatures, through multiple causal paths: worse education outcomes (many days off school during hot months), worse economy (can't work outside), worse life satisfaction -> more autocracies, more water scarcity. Then you get more emigration to the colder north, more confl…
Severe enough to be noticeable, but not severe enough to warrant radical climate action. Not an extinction threat. A "slow trickle of economic damage, some amount of otherwise preventable death and suffering, diffused across the entire world, applied unevenly, and spread thin across many decades" threat.
And stopping the GHG emissions demands radical, coordinated global action. Major emitters would have to pay local costs now - for the sake of global benefits many decades down the line. And those emitters are not the countries that face the worst climate risks. Global superpowers can tolerate climate change - it's countries that already struggle as it is, that don't have the resources to adapt or mitigate damage, that can face a significant uptick in death and suffering rather than damage in the realm of economics.
That makes climate action a very hard sell for the politicians. Thus the tepid response.
By now, I'm convinced that the only viable approaches to climate change lie in the realm of geoengineering. Which does not require multilateral coordinated action against a "tragedy of commons" scenario, and is cheaper than forcing local GHG emissions into negatives.
Even non-permanent geoengineering solutions offset impacts here and now - thus buying time for fossil fuel energy to succumb to the economic advantage of renewables. And geoengineering measures can be enacted unilaterally by many powers - as long as the political will is there to absorb a few strongly worded condemnation letters.