.ON APRIL 2ND a device looking like a snow maker on the deck of the USS Hornet, a nonexistent aircraft-carrier tied in San Francisco Gulf, started creating a haze of salty aerosol bits. The clinical cooperation responsible for the venture, the Marine Cloud Whitening (MCB) program, led due to the College of Washington, is exploring whether such aerosols could aid to reduce temperature modification through a type of "geoengineering". What does this term way-- and also why is it therefore questionable?