The Hot Zone

Earth’s climate could take 100,000 years to recover, and a game to solve our climate woes

Posted by Alison Hawkes on November 3, 2010
Category : Climate Science and Scientists, Climates of the Past, The man made climate

Maybe this isn’t news. But it sure got my attention. The Geological Society of London put out a position statement on climate change this week, and among its many interesting tidbits said that the Earth’s climate could take 100,000 years or longer to recover from this most recent bout of CO2, absent any human mitigation.

The Society based this projection on numerical models of the climate system that went into the 2007 IPCC report. The Society’s advice, based on this conclusion, is a bit of an understatement:  “…Emitting further large amounts of CO2 into the atmosphere over time is likely to be unwise, uncomfortable though that fact may be.”

In a stellar summary of past climates, the Society builds a very convincing argument that the climate troubles we face today do not appear in isolation in Earth’s history. Although the cause of CO2 levels today — namely human-induced emissions –  is a uniquely modern day phenomenon, the Earth has experience tumultuous climate swings in the past.

Based on comparisons of CO2 concentrations with past eras, we may be headed for the “55 million year event,” in which global temperatures shot up by 9-10.8 degrees F quite suddenly. The so-called Paleocene-Eocene Thermal Maximum involved the release of 1,500-2,000 billion tons or more of carbon into the ocean and atmosphere, possibly from a breakdown in methane hydrates under the deep sea floor because of volcanic activity, says the Society statement.

The result was higher ocean temperatures that were more acidic and less oxygenated, and as can be imagined, the loss of many species. In this climate event and other similar ones — namely from 120 and 183 million years ago — it took 100,000 years for the climate to rebound. “…A CO2 release of such magnitude may affect the Earth’s climate for that length of time,” the authors say.

Other possible similarities to draw from the past:

* Warming heats the ocean, causing water to expand and sea level to rise. Relatively small increases in global temperatures — just 5-9 degrees F — have caused the seas to rise by 13-39 feet.

* Sudden changes, on the order of decades, can happen with the Earth’s climate.

* Feedbacks can accentuate the climate change already underway. It’s a bit different nowadays, but the recent geologic pattern of glacial and interglacial periods over the past 800,000 years may be launched by slight tilts in the Earth’s axis, which then caused CO2 releases from the oceans that reinforce the temperature increases already underway. Similarly, today’s temperature increases can be magnified by methane releases in permafrost and peat bogs.

The difference between those times and now — for humans at least — is that in some ways we’re even more vulnerable to dramatic climate swings. Despite modern technology and predictive ability of advanced science, the impacts of climate change, like sea level rise, are going to hit hard on a human population of 6.7 billion people (and rising).

“With the current and growing global population, much of which is concentrated in coastal cities, such a rise in sea level would have a drastic effect on our complex society, especially if the climate were to change as suddenly as it has at times in the past,” the authors write.

A 100,000 year recovery — while short on the geologic timescale — is longer than any of us can imagine enduring.

As a side note, I was happy to see that a British company, Red Redemption Games, is bringing climate change to the gaming world. It’s nice to see something other than the glorification of gun battles. Fate of the World “features a dramatic set of scenarios based on the latest science covering the next 200 years.” You can be the “leader” who can pick a crisis and try and expertly try and solve it. Way to get people to start acting — at least virtually so.

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