Some Scientists Eye Odd Climate Fixes

This photo provided by Columbia University shows a prototype of an air capture device built by Columbia University researchers Klaus Lackner and Frank Zeman. It would suck carbon dioxide from the free-flowing air, perhaps near wind turbines, to help lessen global warming. The carbon dioxide would flow into the bowl at lower left, be separated with absorbent chemicals, then liquid carbon dioxide mix would flow into the bucket in the picture, bottom center, and air without carbon dioxide would flow out the top right corner container. (AP Photo/Columbia University, Federico Barrai) (Federico Barrai - AP)

David Keith, a University of Calgary engineering professor and one of the world's experts in geoengineering, says that just because tinkering with the air, water and sunlight are possible, they should not be substitutes for cutting emissions just because "we've been politically weak-kneed."

Instead, he said, such options should be researched as an "insurance policy" in case global warming is even worse than forecast. And that prospect has caused climate scientists to talk about the issue more openly in recent months.

There is also a chance that discussion of such radical ideas as a volcano or sun shade could shock the world into acting to reduce fossil fuel emissions, Keith said.

However, White House science adviser Jack Marburger, said spending money on geoengineering doesn't make sense. The federal government, which spends about $2 billion on climate change science, invests nearly all of its research on energy sources that produce fewer or no greenhouse gas emissions.

"I don't think it's scientifically feasible at this time to consider a plan like that (geoengineering)," Marburger told The Associated Press. "The real urgency is to reduce carbon dioxide."

In 2001, the Intergovernmental Panel on Climate Change looked at geoengineering as part of its report on how to lessen global warming. It found some promise, worried about unexpected side effects, legal and ethical implications, and concluded that "unlike other strategies, geoengineering addresses the symptoms rather than the causes of climate change."

Even proponents of geoengineering research are wary.

"We are playing with fire here," Keith said. "Those of us suggesting we do something are suggesting it with real nervousness."

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Associated Press Special Correspondent Charles J. Hanley in New York contributed to this report.