.ON APRIL 2ND a contraption resembling a snow device on the deck of the USS Hornet, a defunct aircraft-carrier tied in San Francisco Gulf, began generating a mist of salted aerosol particles. The clinical collaboration responsible for the job, the Marine Cloud Brightening (MCB) program, led due to the University of Washington, is actually checking out whether such sprays could assist to decrease environment change with a form of "geoengineering". What performs this term way-- as well as why is it thus controversial?