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By Root 1256 0

For reasons poorly understood, both polar regions were warming much faster than the rest of the planet. In the north this had resulted in the breakup of the Arctic Ocean’s sea ice, the imminent extinction of many species, including the polar bear, and the subsequent stall of the Gulf Stream. In the south it had resulted in the rapid breakup of the giant ice shelves hugging the Antarctic coast, unblocking the big glaciers falling into the Ross Sea so that they became “ice rivers,” moving so rapidly down their channels that they were destabilizing the West Antarctic Ice Sheet, the biggest variable in the whole picture: if this sheet came off its underwater perch on the sea floor, the world would suffer impacts greater by far than what had been witnessed already, most especially a rapid rise in sea level, up to as much as seven meters if the whole sheet came off.

Still it was hard to imagine it would ever happen to you.

There were further ramifications. The ocean bottom, where it drops from the continental shelves to the abyssal seafloor, is in many places a steep slope, and these slopes are coated by thick layers of mud that contain methane in the form of clathrates, a chemical form of freezing that cages molecules of the gas in a frozen matrix. As ocean temperatures rose, these chemical cages were being destabilized, and release of the methane could then cause underwater avalanches in which even more methane was released, rising through the water and rejoining the atmosphere, where it was a greenhouse gas much more powerful than carbon dioxide. Warmer atmosphere meant warmer ocean meant released methane meant warmer atmosphere meant—

A complex of cycles—geologic, oceanic, and atmospheric—all blending into each other and affecting the rest. The interactions were so complex, the feedbacks positive and negative so hard to gauge in advance, the unforeseen consequences so potentially vast, that no one could say what would happen next to the global climate. Modeling had been attempted to estimate the general rise in temperature, and actually these had been refined to the point that there was some agreement as to the outside parameters of possible change, ranging from about a two to an eleven degree C. rise in temperatures—a very big range, but that’s how uncertain any estimates had to be at this point. And even if the estimates could have been tighter, global averages did not reveal much about local or ultimate effects, as people were now learning. There were nonlinear tipping points, and now some of these were beginning to reveal themselves. The stall of the Gulf Stream was expected to chill the temperature in the northern hemisphere, especially on both sides of the Atlantic; further effects were much less certain. The recent two-year failure of the monsoon was not understood, nor its violent return, and the effects of both, having devastated communities all across south Asia and beyond, in Africa and southeast Asia, would create still further effects as yet unforeseen. China’s drought was ongoing, as was the longest-ever El Niño, now called the Hyperniño. Desertification in the Sahel was moving south at an ever-increasing rate, and South America was suffering the worst floods in recorded history because of the rain brought by the El Niño. It had rained in the Atacama.

Wild weather everywhere. The most expensive insurance year ever, for the eighth year in a row, and by more than ever. That was just a number, an amount of money distributed out through the financial systems of the world by insurance of all kinds; but it was also a measure of catastrophe, death, suffering, fear, insecurity, and sheer massive inconvenience.

The problem they faced was that everything living depended on conditions staying within certain tight climactic parameters. The atmosphere was only so thick; as Frank put it once, talking to Anna and Kenzo, when you drive by Mount Shasta on US Interstate 5, you can see the height of the livable part of the atmosphere right there before your eyes. No permanent human settlement on Earth was higher than Shasta