.ON APRIL 2ND a contraption being similar to a snowfall equipment on the deck of the USS Hornet, an inoperative aircraft-carrier anchored in San Francisco Gulf, started producing a haze of salty spray bits. The scientific collaboration responsible for the venture, the Marine Cloud Whitening (MCB) programme, led by the University of Washington, is checking out whether such sprays may assist to reduce climate adjustment with a form of “geoengineering”. What performs this phrase method– and also why is it so questionable?