.ON APRIL 2ND a gizmo appearing like a snowfall maker on the deck of the USS Hornet, an invalid aircraft-carrier tied in San Francisco Bay, began creating a mist of salted aerosol bits. The clinical partnership responsible for the venture, the Marine Cloud Brightening (MCB) program, led due to the Educational institution of Washington, is actually examining whether such aerosols might assist to reduce temperature change via a type of “geoengineering”. What performs this phrase mean– as well as why is it so disputable?