.ON APRIL 2ND a gizmo being similar to a snow maker on the deck of the USS Hornet, an obsolete aircraft-carrier moored in San Francisco Bay, started generating a mist of salted aerosol bits. The clinical collaboration behind the project, the Marine Cloud Whitening (MCB) program, led due to the Educational institution of Washington, is actually investigating whether such aerosols may aid to slow down temperature change via a type of "geoengineering". What does this condition method-- and why is it therefore disputable?