.ON APRIL 2ND a contraption resembling a snowfall machine on the deck of the USS Hornet, an invalid aircraft-carrier tied in San Francisco Bay, started making a mist of salty aerosol fragments. The medical cooperation behind the project, the Marine Cloud Whitening (MCB) program, led due to the College of Washington, is actually checking out whether such sprays may assist to reduce weather adjustment with a kind of "geoengineering". What does this phrase way-- and why is it thus questionable?