A Limestone Sunshade Could Be a Risky Way to Cool the Planet
“My view is that solar reengineering is a supplement, and in the end we still have to cut emissions,” said David Keith, professor of applied physics and public policy at Harvard and author of the new paper.
“But cutting emissions doesn’t cut the risk. A combination might to a better job.”
Keith says that a lot more research is needed at some of the possible side effects of putting calcite, which is abundant in limestone, into the atmosphere. The study uses computer models to see possible effects of spraying small calcite particles about 12 to 15 miles above the Earth’s surface in a region about 30 degrees north and south of the equator. That would cover most of the world’s tropical forests and oceans.
RELATED: Earth Day, Plan B: Five Bold Geoengineering Plans
The modeling also shows that the calcite dispersal would help protect against high-level ozone loss. The ozone layer helps protect the Earth from harmful solar radiation.
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