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A group of Harvard researchers led by David Keith, a professor of applied physics and public policy, just proposed a different solution in the Proceedings of the National Academy of Sciences. An aerosol of calcium carbonate would have a similar cooling effect as sulfur dioxide on the upper atmosphere and help protect the ozone layer as a bonus. The approach is akin to giving the atmosphere a handful of antacid tablets. The aerosol would block some incoming solar energy and neutralize airborne acid particles that are bad for the ozone.

BELLEVUE – The FBI is investigating after envelopes containing white powder showed up in government offices from Seattle to Boise. In Bellevue, a building with offices of the Internal Revenue Service was evacuated around 12:30 p.m. A female worker said she opened an envelope in the mailroom and white powder "poofed" out. "One worker was directly exposed and another worker was close enough nearby to be concerned. We've taken both of them to the hospital," said Lt. Eric Keenan of the Bellevue Fire Dept. Federal and local investigators converged on the four-story building. While Port of Seattle bomb dogs searched...

Marine Organisms Threatened By Increasingly Acidic Ocean Corals and Plankton May Have Difficulty Making Shells Every day, the average person on the planet burns enough fossil fuel to emit 24 pounds of carbon dioxide to the atmosphere, out of which about nine pounds is then taken up by the ocean. As this CO2 combines with seawater, it forms an acid in a process known as ocean acidification. A new study by an international team of oceanographers published in the September 29, 2005 issue of Nature reports that ocean acidification could result in corrosive chemical conditions much sooner than previously thought....