.ON APRIL 2ND a gizmo being similar to a snow maker on the deck of the USS Hornet, a defunct aircraft-carrier moored in San Francisco Gulf, started generating a haze of salted aerosol particles. The clinical partnership responsible for the job, the Marine Cloud Whitening (MCB) program, led by the Educational institution of Washington, is actually looking into whether such aerosols could aid to slow temperature adjustment through a type of "geoengineering". What performs this term method-- as well as why is it thus disputable?