.ON APRIL 2ND a device appearing like a snow device on the deck of the USS Hornet, an obsolete aircraft-carrier anchored in San Francisco Gulf, started making a moisture of salty aerosol fragments. The scientific partnership responsible for the project, the Marine Cloud Whitening (MCB) programme, led due to the University of Washington, is actually checking out whether such sprays could aid to slow down weather adjustment via a form of "geoengineering". What does this condition mean-- as well as why is it thus questionable?