.ON APRIL 2ND a device resembling a snow equipment on the deck of the USS Hornet, a defunct aircraft-carrier moored in San Francisco Gulf, started producing a moisture of salty spray fragments. The medical partnership behind the venture, the Marine Cloud Whitening (MCB) programme, led due to the University of Washington, is actually looking into whether such sprays could aid to slow down environment improvement through a form of "geoengineering". What does this condition method-- as well as why is it thus disputable?