.ON APRIL 2ND a device resembling a snow machine on the deck of the USS Hornet, a nonexistent aircraft-carrier anchored in San Francisco Gulf, began making a moisture of salty spray fragments. The scientific collaboration responsible for the project, the Marine Cloud Whitening (MCB) program, led due to the College of Washington, is actually investigating whether such aerosols might help to decrease weather modification through a kind of "geoengineering". What does this condition mean-- and also why is it therefore debatable?