.ON APRIL 2ND a gizmo appearing like a snow equipment on the deck of the USS Hornet, a defunct aircraft-carrier tied in San Francisco Bay, started making a moisture of salty spray fragments. The medical cooperation behind the venture, the Marine Cloud Brightening (MCB) program, led due to the Educational institution of Washington, is exploring whether such aerosols could aid to decrease climate modification through a type of "geoengineering". What performs this term way-- and also why is it so controversial?