.ON APRIL 2ND a gizmo appearing like a snow device on the deck of the USS Hornet, a nonexistent aircraft-carrier anchored in San Francisco Gulf, started generating a mist of salty spray particles. The scientific partnership responsible for the venture, the Marine Cloud Brightening (MCB) program, led by the Educational institution of Washington, is exploring whether such aerosols may aid to reduce weather adjustment through a form of “geoengineering”. What does this term method– as well as why is it so debatable?