BRITISH TO TEST Geoengineering Scheme. “In October, British researchers supported by the U.K. government will attempt to pump water a kilometer into the air using little more than a helium balloon and a rubber hose. The experiment, which will take place at a military airfield along England’s east coast, is meant as a test of a proposed geoengineering technique for offsetting the warming effects of greenhouse gases. If the balloon and hose can handle the water’s weight and pressure, similar pipes rising 20 kilometers could pump tons of reflective aerosols into the stratosphere.”