Expert: Carbon Dioxide Emissions Could Last Millenniums

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Expert: Carbon Dioxide Emissions Could Last Millenniums

Renee Schoof

Satellite image shows a layer of haze caused by pollution over east-central China. A US satellite that was meant to monitor global carbon dioxide emissions has plummeted into the ocean near Antarctica after failing to reach orbit. (AFP/NASA/Ho)





"Ultimately, the amount of fossil fuel available could be enough to raise the atmospheric CO2 concentration higher than it has been in millions of years," Archer wrote.


Archer studies the carbon cycle of Earth as it interacts with global climate. His slim book is a clear explanation of carbon dioxide and climate change for nonscientists. It also explains how the climate has changed in the distant past and looks ahead to the deep future.

His work has been a part of what John Holdren, whom President Obama named as his science adviser, has called the "tremendous effort" among scientists to reach a "center of gravity" in the understanding of climate change. The results of that work are available in the reports of the National Academy of Sciences and the Intergovernmental Panel on Climate Change. The conclusion, as Holdren summed it up at his confirmation hearing recently: "Climate change is real, it's accelerating, it is caused in substantial part by human activity, it is dangerous and it is getting more so."

Like Holdren and other climate experts, Archer concludes that there's still time to cut fossil fuel emissions enough to avoid disaster.

"The question may come down to ethics, rather than economics," Archer wrote, much as the issue of slavery did more than a century ago. "Ultimately it didn't matter whether it was economically beneficial or costly to give up. It was simply wrong."

Some questions and answers with David Archer:

Q: You write that the climate effects of fossil fuel burning will last longer than nuclear waste. Most discussions of climate change focus on this century. Why did you look farther out?

A: Everyone knows that nuclear waste lasts a long time, and it seems to make a difference to them. It makes a difference to me the longevity of global warming, too.

Q: Some people, though, don't believe it's a problem.

A: There are people who will "believe" anything they want to; the question is whether anyone has a scientifically credible justification for that belief. It was predicted over a century ago that rising CO2 concentrations in the air would warm the planet. Now it seems to be doing just that, just as predicted. If anyone can explain why things should not work in this way, then I'd be interested to hear, but so far there are just no completing ideas, just beliefs stemming from whatever source, and an active campaign at disinformation sponsored by the fossil fuel industry.

Q: What difference does the long view make?

A: The book makes the point that global warming from CO2 emissions will last for thousands of years into the future. To me that changes the picture, especially when thinking about the economics of climate change or the possibility of "engineering" the planet cooler by putting haze in the stratosphere or something like that. It also means that the eventual sea level rise from releasing CO2 could be a hundred times greater than the forecast for the year 2100.

Q: Is Earth doomed to an ice-free state, mass extinctions and rising seas?

A: No, the damage has not yet been done. We could stop releasing CO2. Technologically that is not so hard.

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