I think carbon taxes are the opposite of what the OP is talking about. Carbon taxes are artificial barriers to using fossil fuels.
On the other hand, when technology improves so that electric cars cost less per mile than gasoline cars, people won't necessarily buy them to be green, they'll buy them because they're a cheaper form of transportation that happens to be greener.
Same with wind and solar power. When a solar farm on 10 acres of land can produce more energy than a coal plant on the same 10 acres, then power companies will build them instead of coal - not to be "green", but to make more money.
On the other hand, when technology improves so that electric cars cost less per mile than gasoline cars, people won't necessarily buy them to be green, they'll buy them because they're a cheaper form of transportation that happens to be greener.
Same with wind and solar power. When a solar farm on 10 acres of land can produce more energy than a coal plant on the same 10 acres, then power companies will build them instead of coal - not to be "green", but to make more money.