The agreement doesn't per say matter all that much (Trump wasn't going to obey it anyway).
But it's hard for me to see how failing to tax externalities of fossil fuels are not making it that much harder for renewables and nuclear to win. I actually find you a bit optimistic; natural gas is extremely cheap these days (in part because the externalities aren't taxed); while it is much better than coal (in many dimensions), switching all fossil fuels to a "less bad" fossil fuel aren't enough to hit necessary emissions targets.
Taxing fossil fuels would speed up the process, but the writing is on the wall when it comes to fossil fuels as a whole. You know when Exxon Mobil and other big players are starting to get into the alternative energy business the tide is turning.
But it's hard for me to see how failing to tax externalities of fossil fuels are not making it that much harder for renewables and nuclear to win. I actually find you a bit optimistic; natural gas is extremely cheap these days (in part because the externalities aren't taxed); while it is much better than coal (in many dimensions), switching all fossil fuels to a "less bad" fossil fuel aren't enough to hit necessary emissions targets.