I’m not sure what to make of our willingness to participate in the terraforming of the Earth. To explore it, I’ll consider an alternative history in which Antarctica was marginally habitable, and colonized a million years ago by woolly hominids who developed a Yeti civilization. Our whaling vessels meet up with them in the 1820s, but it’s so cold down there that nobody feels the need to molest them except for few hardy anthropologists, the occasional overzealous missionary expedition, and the usual cohort of scientists who will study the ends of the Earth, no matter how inhospitable. Inevitably, the Yeti spend some late nights with the scientists in their hot tubs watching the aurorae.
They get to talking about the magnetosphere, some atmospheric physics, and the geology of their ice-clad homeland. One day they decide their lives would be better if they could inhabit the entire continent, instead of just clinging to the coastal fringe, and so with the help of some misguided sympathizers, they develop a vast clandestine industrial complex pumping long-lived fluorinated super greenhouse gasses like CF4, C2F6, and SF6 into the atmosphere to warm things up. These compounds are vastly more powerful warming agents than CO2 and methane. They are also long lived atmospheric species, sticking around for up to 50,000 years. If a serious industrial complex were set up to produce and release them en masse, they would close a good chunk of the atmosphere’s thermal infrared window and radically alter the climate for tens of thousands of years. This atmospheric engineering could be done over the course of an election cycle, especially if the Yeti bastards had help from the cold-hearted Canucks and Russkies.
Would the G-20, the OECD or the UN Security Council stand by while a rogue Yeti nation threatened the billions of people who live in coastal cities, or depend on glacial water supplies, all in the name of Manifest Destiny? Of course not. We’d be more likely to bomb their furry white asses back into the Ice Age.