This is not only wrong but you are bending over backwards to maintain the state of ignorance which makes it possible to say that. Most of the carbon in the atmosphere did not come from developing countries, and every reduction buys more time to deal with the problem so, yes, local measures matter: as an example, the U.S. transportation sector is so carbon intensive that getting our average efficiency up will reduce global emissions by more than entire other countries produce.

https://www.statista.com/statistics/1118464/transportation-c... shows the American trend, then look at which other countries that’s similar to assuming we electrify a given fraction of the transportation sector:

https://en.wikipedia.org/wiki/List_of_countries_by_carbon_di...

This is even more wrong when you look at how Africa is electrifying. Unlike the United States, China continued to invest in solar panel production and so they’re now the cheapest option for electrical power for millions of people since solar panels run for decades and don’t require trucking diesel fuel around or building out power grids. Investments in batteries are having the same cycle: richer countries have the research universities and product development but then anyone can buy the product.

https://apnews.com/article/solar-energy-china-imports-batter...

That’s why the fossil fuels spend so much money spreading messages like yours: they grew fat on government subsidies and they need those subsidies to continue or even expand as the basic economics increasingly favor renewables. Trump has to force coal plants to stay open because otherwise the operators would switch to cheaper options.