Re-posted from February 13, 2007
I stumbled into an online petition yesterday entitled "End Climate Change Now!" Such foolishness makes me laugh and cry. If every human on the planet were to sacrifice their lives on the altar of Gaia today, the climate would continue to change. Who do we think we are, anyway? Climate is always going either up, or down. It never stands still, but zigs and zags, like every natural phenomenon. But it led my thoughts to lovely, remote Greenland.
The population of Greenland is 56,000, about 85% Eskimo. As you recall, Denmark "owns" Greenland, but they are mostly self-governing. The imperialist Eskimos invaded pristine Greenland around the same time that the imperialist Erik "the Red" Thorwaldsson began to bring settlers to Greenland, in the late 900s.
At that time, Greenland had far less ice, was green, and was warm enough for farming. By the 1300s, Greenland had become too cold for the Norwegian Vikings, and they all returned home.
Earth has been in an Ice Age (mostly Pleistocene - previously the entire planet had been tropical for a long time) for 3 million years ("Ice Age" defined by ice on both poles), with repeated advances and retreats of the ice sheets, and repeated micro and macro fluctuations which are just trivial blips on a giant chart.
We only know a lot about a few of these blips, such as the "Little Ice Age" of 1000-1350s, and the "Medieval Warm Period" (1400-1900), when it was possible to grow all sorts of crops in England.
Major "cool periods," or Ice Ages, occur about every 200 million years, and last several to tens of millions of years. The most recent advance of our current ice sheet peaked about 10,000 years ago (this one tends to advance and reteat every 15-18,000 years). We, in our micro view, often term the most recent advance "The Ice Age" - the one with Wooly Mammoths etc. But we are, historically, in the middle of the big one now. Will another little ice advance occur and bury NYC? Definitely. We are in the longest cold period in the earth's history.
Stop climate change? Heck no. It's freezing out, sleeting and snowing, and we are, in fact, in the middle of a darn ice age. A bit of a warm spell should be welcomed as a blessing. No, I will sign no Stop Warming petition, but I'd sign one to stop tectonic plate movement. I do not want MA to reconnect itself to Africa just now, and only Halliburton could move those things.
Check out this site for historical climate changes. As you can see by the graph on the right from Scotese, we have been in a heavy duty cold spell for quite a while. When our climatologists look at climate, they tend to look at the micro picture, but that is like trying to predict the stock market by looking at one day's fluctuations. It's meaningless. And apparently most folks, other than the loonies, have figured that out.
Problem is, we have another blip of a serious Ice Age coming on our path to our return to the normal Pleistocene tropical climate. Can we handle it?
We will survive; we can cope, but just as surely we will all die off, in time, in whatever apocalypse the future has in store for mankind - even if we last long enough to see the sun fade out. That is history's lesson, and the lesson of science.
Image of Mammoth: Moravec does excellent prehistoric paintings. Check out his cool website.
