Global warming ... more like a snap freeze super ice storm
Most people see climate change as a gradual warming-up that will hurt some people and benefit others.
The people of Tuvalu and quite a lot of the Netherlands will be severely inconvenienced as rising sea levels cover their homes, but they will either move or learn to breathe underwater. So no rush, no panic, and don't take any measures that might hurt economic growth.
But anyone who has been paying attention to the evidence coming out of the Greenland ice cores for the past 20 years should know that the real threat is not gradual warming.
It is that the warming will trigger an abrupt and rapid cooling of the global climate, with catastrophic consequences for existing human populations.
The Greenland ice cores, a quarter-million-year record of annual snowfall that also tells us about average temperature, precipitation and even wind speed, contain an alarming message.
When the climate mode shifts, global temperatures crash in 10 years or less - and stay down for centuries or millennia. And the very worst news is that the sudden flip into cool-and-dry is caused by gradual global warming.
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