.ON APRIL 2ND a contraption being similar to a snowfall equipment on the deck of the USS Hornet, an inoperative aircraft-carrier tied in San Francisco Bay, began creating a moisture of salted aerosol fragments. The medical collaboration behind the task, the Marine Cloud Brightening (MCB) program, led due to the Educational institution of Washington, is actually checking out whether such aerosols could aid to slow weather improvement with a kind of "geoengineering". What does this condition method-- as well as why is it so disputable?