.ON APRIL 2ND a gizmo appearing like a snow maker on the deck of the USS Hornet, an inoperative aircraft-carrier anchored in San Francisco Bay, began producing a haze of salty spray bits. The medical cooperation behind the job, the Marine Cloud Brightening (MCB) program, led due to the College of Washington, is actually investigating whether such aerosols might help to decrease environment change with a type of "geoengineering". What does this phrase method-- as well as why is it thus disputable?