Other techniques aim to enhance marine cloud reflectivity by introducing sea salt aerosols in low clouds, mimic the effects of volcanic eruptions by injecting sulphate aerosols into the lower stratosphere, or place shields or deflectors in space to reduce the amount of incoming solar radiation.

FORBES: Green Groups Blast U.N. Climate Panel for Alarmism

Result: All five shields did virtually nothing to lower a cell phone's radiation exposure to the brain, says Donald Mays, the institute's technical director.

FORBES: Shield Sham