Fifty Degrees Below. Kim Stanley Robinson

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СКАЧАТЬ existence. Life outdoors. So often he had thought about, read about, and written about the biological imperatives in human behavior – about their primate nature, and the evolutionary history that had led to humanity’s paleolithic lifestyle, which was the suite of behaviors that had caused their brains to balloon as rapidly as they had; and about the residual power of all that in modern life. And all the while, through all that thinking, reading, and writing, he had been sitting at a desk. Living like every other professional worker in America, a brain in a bottle, working with his fingertips or his voice or simply his thoughts alone, distracted sometimes by daydreams about the brief bursts of weekend activity that would get him back into his body again.

      That was what was crazy, living like that when he held the beliefs he did.

      Now he was considering acting in accordance with his beliefs. Something else he had heard the Khembalis say at the Quiblers’, this time Drepung: If you don’t act on it, it wasn’t a true feeling.

      He wanted these to be true feelings. Everything had changed for him on that day he had gone to the Khembali ambassador’s talk, and then run into the woman in the elevator, and afterward talked to Drepung at the Quiblers’ party, and then, yes, broken into the NSF building and tried to recover his resignation. Everything had changed! Or so it had felt; so it felt still. But for it to be a true feeling, he had to act on it.

      

      Meaning also, as part of all these new behaviors, that he had to meet with Diane Chang, and work with her on coordinating NSF’s response to the climate situation that was implicated in the great flood and many other things.

      This would be awkward. His letter of resignation, which Diane had never directly acknowledged receiving, was now an acute embarrassment to him. It had been an irrational attempt to burn his bridges, and by all rights he should now be back in San Diego with nothing but the stench of smoke behind him. Instead, Diane appeared to have read the letter and then ignored it, or rather, considered how to use it to play him like a fish, and reel him back into NSF for another year of service. Which she had done very skillfully.

      So now he found that he had to stifle a certain amount of resentment as he went up to see her. He had to meet her secretary Laveta’s steely eye without flinching; pretend, as the impassive black woman waved him in, that all was normal. No way of telling how much she knew about his situation.

      Diane sat behind her desk, talking on the phone. She gestured for him to sit down. Graceful hands. Short, Chinese-American, good-looking in an exotic way, businesslike but friendly. A subtly amused expression on her face when she listened to people, as if pleased to hear their news.

      As now, with Frank. Although it could be amusement at his resignation letter, and the way she had jiu-jitsued him into staying at NSF. So hard to tell with Diane; and her manner, though friendly, did not invite personal conversation.

      ‘You’re into your new office?’ she asked.

      ‘My stuff is, anyway. It’ll take a while to sort out.’

      ‘Sure. Like everything else these days! What a mess it all is. I have Kenzo and some of his group coming this morning to tell us more about the Gulf Stream.’

      ‘Good.’

      Kenzo and a couple of his colleagues in climate duly appeared. They exchanged hellos, got out laptops, and Kenzo started working the Power Point on Diane’s wall screen.

      All the data, Kenzo explained, indicated stalls in what he called the ‘thermohaline circulation.’ At the north ends of the Gulf Stream, where the water on the surface normally cooled and sank to the floor of the Atlantic before heading back south, a particularly fresh layer on the surface had stalled the downwelling. With nowhere to go, the water in the current farther south had slowed to a halt.

      What was more, Kenzo said, just such a stall in the thermohaline circulation had been identified as the primary cause of the abrupt climate change that paleoclimatologists had named the Younger Dryas, a bitter little ice age that had begun about eleven thousand years before the present, and lasted for a few thousand years. The hypothesis was that the Gulf Stream’s shutdown, after floods of fresh water coming off the melting ice cap over North America, had meant immediately colder temperatures in Europe and the eastern half of North America. This accounted for the almost unbelievably quick beginning of the Younger Dryas, which analysis of the Greenland ice cores revealed had happened in only three years. Three years, for a major global shift from the worldwide pattern that climatologists called warm-wet, to the worldwide pattern called cool-dry-windy. It was such a radical notion that it had forced climatologists to acknowledge that there must be nonlinear tipping points in the global climate, leading to general acceptance of what was really a new concept in climatology: abrupt climate change.

      ‘What caused the stall again?’ Diane said.

      Kenzo clicked to the next slide, an image of the Earth portraying the immense ice cap that had covered much of the northern hemisphere throughout the last ice age. The end of that one had arrived slowly, in the old-fashioned linear way, melting the top of the ice cap and creating giant lakes that rested on the remaining ice. These lakes had been held in place by ice dams that were themselves melting, and when the dams had at last given way, extraordinarily large floods of fresh water had rushed down into the ocean, emptying volumes as large as the Great Lakes in a matter of weeks. Signs left on the landscape indicated this had happened down the watersheds of the St. Lawrence, the Hudson, and the Mississippi, and out west, a lake covering most of Montana had drained down the course of the Columbia River several times, leaving an area in Washington called the scablands which gave eloquent testimony to the power of these floods to tear into the bedrock. Presumably the same thing had happened on the East Coast, but the signs had mostly been submerged by rising sea levels or the great eastern forest, so that they were only now being discerned.

      Frank, looking at the map on the screen, thought of how Rock Creek had looked that morning at dawn. Theirs had been a very tiny flood relative to the ones Kenzo was describing, and yet the watershed was devastated.

      So, Kenzo continued, fresh water, dumped into the North Atlantic all at once, appeared to block the thermohaline cycle. And nowadays, for the last several years, the Arctic Ocean’s winter sea ice had been breaking up into great fleets of icebergs, which then sailed south on currents until they encountered the Gulf Stream’s warm water, where they melted. The melting zones for these icebergs, as a map on the next slide made clear, were just above the northern ends of the Gulf Stream, the so-called downwelling areas. Meanwhile the Greenland ice cap and glaciers were also melting much faster than had been normal, and running off both sides of that great island.

      ‘How much fresh water in all that?’ Diane asked.

      Kenzo shrugged. ‘The Arctic is about ten million square kilometers. The sea ice lately is about five meters thick. Not all of that drifts into the Atlantic, of course. There was a paper that estimated that about twenty thousand cubic kilometers of fresh water had diluted the Arctic over the past thirty years, but it was plus or minus five thousand cubic kilometers.’

      ‘Let’s get better parameters on that figure, if we can,’ Diane said.

      ‘Sure.’

      They stared at the final slide. The implications tended to stall on the surface of the mind, Frank thought, like the water in the north Atlantic, refusing to gyre down. The whole world, ensconced in a global climate mode called warm and wet, and getting warmer and wetter because of global warming caused by anthropogenically released greenhouse gases, could switch to a global pattern that was cold, dry, and windy. And the last time it happened, it had taken three years. Hard to believe; but the Greenland ice core data were very clear, СКАЧАТЬ