.ON APRIL 2ND a contraption resembling a snow machine on the deck of the USS Hornet, an obsolete aircraft-carrier tied in San Francisco Gulf, began generating a mist of salted spray particles. The medical partnership responsible for the project, the Marine Cloud Brightening (MCB) program, led by the University of Washington, is actually examining whether such aerosols could assist to slow environment change via a type of "geoengineering". What performs this term method-- as well as why is it thus questionable?