The way to phase out fossil fuels is to include their price to society and the environment in their market price. The Citizens Climate Lobby is an organization that proposes a fee be placed on fossil fuels based on the fuels actual CO2 content. The revenue from the fee would not go to government programs but be returned to the public as a monthly dividend to protect households from rising energy costs caused by the new fee. The policy calls for true cost comparisons between fuels to keep them from being kept artificially cheap.
https://citizensclimatelobby.org
https://citizensclimatelobby.org/carbon-fee-and-dividend/