.ON APRIL 2ND a gizmo resembling a snowfall device on the deck of the USS Hornet, a nonexistent aircraft-carrier moored in San Francisco Gulf, began producing a haze of salty aerosol bits. The medical partnership behind the job, the Marine Cloud Brightening (MCB) program, led due to the College of Washington, is looking into whether such aerosols might aid to reduce weather adjustment with a type of "geoengineering". What does this term way-- as well as why is it thus disputable?