.ON APRIL 2ND a device appearing like a snow device on the deck of the USS Hornet, an obsolete aircraft-carrier tied in San Francisco Gulf, began creating a mist of salted aerosol fragments. The scientific collaboration behind the project, the Marine Cloud Brightening (MCB) program, led due to the University of Washington, is actually looking into whether such aerosols might help to slow down climate modification through a kind of "geoengineering". What performs this phrase way-- and also why is it therefore debatable?