Geoengineering could help stave off global warming, but it could also create some big problems
If reducing carbon emissions fails to stop climate change, we may one day have the option of sending mirror-supporting satellites into space or filling the stratosphere with light-reflecting particles to block the sun's rays.
According to a new study, such measures could significantly cool Earth. But researchers caution that if they if they do not work or are suddenly halted, they could make matters worse.
"As far as I know, this is the first century-scale, time-dependent simulation of a geoengineering scheme," says Ken Caldeira, a climate scientist at the Carnegie Institution of Washington's Department of Global Ecology in Stanford, Calif., and senior author of the study published this week in Proceedings of the National Academy of Sciences USA. Geoengineering refers to activities designed to alter Earth's climate that may include blocking the sun, large-scale reforestation and sequestering carbon dioxide in the ocean.
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