Governments need to be heavily subsidizing public transportation for urban areas and electric vehicles for rural areas.
Simply pushing strict emission standards is not enough. Yes, it gets less efficient vehicles out of the consumer stream, but those vehicles aren’t coming down in price. You want to get gas vehicles off the road quickly, and supercharge the economy in the process? Offer a massive rebate for electric vehicles, at the dealer level, so any person can walk into a dealership and buy an electric vehicle cheaper than a gas powered one. Non-commercial internal combustion engines will all but disappear from the road in less than a decade.
And once everyone is on electric, you can feed that with solar and wind.