WASHINGTON — Tinkering with Earth’s climate to chill runaway global warming — a radical idea once dismissed out of hand — is being discussed by the White House as a potential emergency option, the president’s new science adviser said Wednesday.
That’s because global warming is happening so rapidly, John Holdren said.
The concept of using technology to purposely cool the climate is called geoengineering. One option raised by Holdren and proposed by a Nobel Prize-winning scientist includes shooting pollution particles into the upper atmosphere to reflect the sun’s rays.
Using such an experimental measure is only being thought of as a last resort, Holdren said.
“It’s got to be looked at,” he said. “We don’t have the luxury … of ruling any approach off the table.”
His concern is that the United States and other nations won’t slow global warming fast enough and that several “tipping points” could be fast approaching. Once such milestones are reached, such as complete loss of summer sea ice in the Arctic, it increases chances of “really intolerable consequences,” he said.
Twice, Holdren compared global warming to being “in a car with bad brakes driving toward a cliff in the fog.”
Holdren said discussions include Cabinet officials and heads of sub-Cabinet level agencies, such as NASA and the Environmental Protection Agency.
The 65-year-old physicist is far from alone in taking geoengineering seriously. The National Academy of Sciences is making it the subject of the first workshop in its new climate challenges program for policymakers, scientists and the public.
The American Meteorological Society is crafting a policy statement that says “it is prudent to consider geoengineering’s potential, to understand its limits and to avoid rash deployment.”
Holdren, a 1981 winner of a MacArthur Foundation “genius” grant, outlined these possible geoengineering options:
Creating artificial “trees” — giant towers that suck carbon dioxide out of the air and store it.
The first approach would “try to produce a cooling effect to offset the heating effect of carbon dioxide and other greenhouse gases,” Holdren said.
While the idea could strike some people as too risky, the Obama administration could get unusual support on the idea from groups that have often denied the harm of global warming in the past.
The conservative think tank American Enterprise Institute has its own geoengineering project, saying it could be “feasible and cost-effective.” And Cato Institute scholar Jerry Taylor said Wednesday: “Very few people would rule out geoengineering on its face.”
Holdren didn’t spell out under what circumstances such extreme measures might ever be called for. And he emphasized they are not something to rely on.
“It would be preferable by far,” he said, “to solve this problem by reducing emissions of greenhouse gases.”
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