ylexot
Super Genius
This article ROCKS!
“What I’m going to try to do the rest of today and also probably on Tuesday is bring you up to date on this. I’ll try to avoid editorializing or politicking. I’ll just tell you some stuff. Give you information. There’s lot’s of stuff, and it’s very complicated.”
Gieg gazes upward toward his young charges. “Every single one of you knows more about this than Al Gore,” he tells the undergrads. “And vastly more than anyone in this present administration.”
...and the best part...There’s no way to watch An Inconvenient Truth without getting worried — at least a little worried.
Not Bob Giegengack. He has described Al Gore’s documentary as “a political statement timed to present him as a presidential candidate in 2008.” And he added, “The glossy production is replete with inaccuracies and misrepresentations, and appeals to public fear as shamelessly as any other political statement that hopes to unite the public behind a particular ideology.” This from a guy who voted for Gore in 2000 and says he’d probably vote for him again.
Hmmmm...I think I stated proposed something very similar not too long agoGiegengack may have a personal 50-year perspective on global warming, but the time range he prefers to consult is more on the geologists’ scale. The Earth has been warming, he says, for about 20,000 years. We’ve only been collecting data on that trend for about 200 years. “For most of Earth history,” he says, “the globe has been warmer than it has been for the last 200 years. It has only rarely been cooler.” Those cooler periods have meant things like two miles of ice piled over much of what is now North America. Nothing to be nostalgic for.
The professor hits a button on his computer, and the really long-term view appears — the past 650,000 years. In that time, the Earth’s temperature has gone through regular cycles of rise and fall. The best explanation of those cycles was conceived by a Serbian amateur scientist named Milutin Milankovi´c. Very basically, Milankovi´c said this: The Earth’s orbit around the sun is more or less circular, but when other planets align in certain ways and their gravitational forces tug at the Earth, the orbit stretches into a more elliptical shape. Combined with the tilt of the Earth on its axis as it spins, that greater or lesser distance from the sun, plus the consequent difference in solar radiation that reaches our planet, is responsible for long-term climate change.
NOW TO THE CRUX OF THE Al Gore argument — the idea that rising carbon dioxide levels are causing an increase in temperature.
To determine temperatures and carbon dioxide levels in the distant past, scientists rely on what they call the “proxy record.” There weren’t thermometers. So researchers drill deep down into the Antarctic ice sheet and the ocean floor and pull up core samples, whose varying chemical elements let them gauge both the CO2 levels and the temperatures of the distant past.
Gieg clicks a button, and three charts come together. The peaks and valleys of the Milankovi´c cycles for planetary temperature align well with the ocean-floor estimates, and those match closely the records of carbon dioxide concentrations and temperature indications from ice cores. So, the professor maintains, these core samples from the polar ice and ocean floor help show that the Earth’s temperature and the levels of carbon dioxide in the atmosphere have been in lockstep for tens of thousands of years.
Of course, that was long before anybody was burning fossil fuels. So Giegengack tells his students they might want to consider that “natural” climatic temperature cycles control carbon dioxide levels, not the other way around. That’s the crux of his argument with Gore’s view of global warming — he says carbon dioxide doesn’t control global temperature, and certainly not in a direct, linear way.