.ON APRIL 2ND a contraption being similar to a snowfall device on the deck of the USS Hornet, an invalid aircraft-carrier anchored in San Francisco Bay, began creating a haze of salted aerosol particles. The medical cooperation behind the job, the Marine Cloud Brightening (MCB) program, led by the University of Washington, is actually examining whether such sprays may aid to reduce climate change through a type of "geoengineering". What performs this condition way-- and also why is it therefore debatable?