The global GDP is around $80 trillion. Ditching fossil fuels will cut it by 75% or more. I doubt damage from climate change will top one trillion in the next ten years. Argue long term all you want but near term the financial carnage from shutting down the fossil industry will be hundreds of trillions of dollars and hundreds of millions of lives.
Keeping seven billion people alive without fossil fuels will be a very fine balancing act. With world wide cooperation and every dime of the worlds wealth it could be accomplished. What's most likely to happen is nothing but more talk.