Geoengineers' Ideas to Combat Global Warming

As global average temperatures are rising, cutting greenhouse gas emissions like CO2 is (or has to be) a top priority in policy making. Anyway, a growing group of scientists is also considering measures to develop new techniques to mitigate global warming. William Broad reports in the NY Times (27.6.2006) about these projects summarized by the term geoengineering. It includes changing cloud formation to reflect the sunlight, feeding plankton to bind CO2 or launching lenses into Earth orbit to deflect sunlight. It's agreed that curbing CO2 emissions has to stay in the first place, but whether political decisions fail or come to late, further option to cool the planet should be accessible.