This naive idea that the necessary carbon dioxide emission reductions can be agreed *and acted on* , by a wide range of divergent political countries who are competitors, is fantasy. Thus it will never be agreed on and adhered to; it is as unrealistic as thinking they will all abandon warfare.
"The actions of our government clearly support the current carbon emitting, fossil energy dependent, economic system that caused the climate to change. It is clear that our government intends to keep ‘business-as-usual’ going as long as possible rather than actually make any change that could help us. Don’t make changes if they threaten our economic system! Wealthy nations are dependent upon the global transfer of goods and services for our economic livelihood. Even emerging economic powers such as China refuse to reduce coal combustion if it threatens economic growth. Our basic position is we will address climate change as long as we can keep economic growth going. It’s the new Green thinking. Every proposed piece of legislation that reduces carbon emissions by reducing fossil energy consumption is discarded because it is not in the best interest of making profits or collecting taxes. A reduction in carbon emissions will require a reduction in energy consumption. If we consume less energy we make and use less stuff, which will precipitate a reduction in economic activity. There is no way of changing the outcome of this calculation. The reality is it isn’t profitable to stop using fossil energy. It will hurt our economy and it will also hurt those who depend upon it."
https://www.animasoul.org/2021/08/11/what-the-ipcc-report-should-have-told-us/#comment-1357
^Reality 101.