.ON APRIL 2ND a gizmo being similar to a snow equipment on the deck of the USS Hornet, an inoperative aircraft-carrier tied in San Francisco Gulf, began generating a moisture of salted aerosol fragments. The medical cooperation behind the project, the Marine Cloud Whitening (MCB) program, led by the University of Washington, is exploring whether such aerosols may aid to slow down climate modification with a type of "geoengineering". What does this phrase mean-- and why is it thus questionable?