If environmentalists and governments really wanted to solve this problem, they would be all in on nuclear energy. It is by far the safest, cleanest, most carbon-neutral form of energy we have that we can produce reliably at volume (base load). We went decades without building any new nuclear power plants in the US.
Instead, what you actually see happening is environmental groups actively working to _shut down_ nuclear reactors before alternate power sources are ready and available, like in Germany and New York. This of course then results in higher prices, brown outs, and burning more coal and natural gas until more alternate power sources can be built to meet demand, also making the pollution issue much worse in the short term. Talk about shooting yourself in the foot.