We in the temperate zones of Planet Earth have been waging war on folks at the Equator for the past few hundred years. We dig up dinosaur blood and coal, set it on fire, and fill with atmosphere with CO2. Who suffers most from the resulting warming? Folks who live at sea level near the Equator, where it was already too damn hot.
Suppose that, 25 years from now, the Chinese develop an awesome solar-powered CO2-extraction machine. Barack Obama dusts off his Nobel Peace Prize to get all of the correct-thinking countries to buy and run these machines until CO2 is reduced to a level that is optimum for the U.S. and similarly-situated nations.
What stops Malaysia, Indonesia, Vietnam, Ecuador, Venezuela, Saudi Arabia, Nigeria, et al. from deciding to buy and run carbon sequestration machines until the Earth gets kicked back into its “going back towards an Ice Age” phase?
It is not as though these folks really owe us temperate-zone-dwellers anything, right?