.ON APRIL 2ND a contraption being similar to a snowfall equipment on the deck of the USS Hornet, a nonexistent aircraft-carrier tied in San Francisco Bay, started generating a haze of salted aerosol particles. The medical cooperation responsible for the project, the Marine Cloud Brightening (MCB) programme, led by the University of Washington, is actually looking into whether such sprays could aid to decrease temperature modification by means of a kind of "geoengineering". What performs this phrase way-- as well as why is it therefore controversial?