.ON APRIL 2ND a device appearing like a snowfall machine on the deck of the USS Hornet, a defunct aircraft-carrier tied in San Francisco Bay, began producing a moisture of salted aerosol bits. The scientific partnership behind the project, the Marine Cloud Whitening (MCB) program, led due to the Educational institution of Washington, is actually examining whether such aerosols could help to slow down temperature change by means of a form of “geoengineering”. What performs this phrase mean– and also why is it thus disputable?