.ON APRIL 2ND a gizmo looking like a snow equipment on the deck of the USS Hornet, a nonexistent aircraft-carrier tied in San Francisco Gulf, started generating a moisture of salty spray bits. The medical cooperation behind the venture, the Marine Cloud Brightening (MCB) program, led due to the College of Washington, is exploring whether such sprays might aid to slow down temperature adjustment with a form of "geoengineering". What performs this condition method-- and also why is it therefore debatable?