Saturday, February 20, 2010 - Annual AAAS Meeting (American Association for the Advancement of Science) at the San Diego Convention Center. Scientist Alan Robock, Rutgers University, meets with protesters before his scheduled session, "Can Geoengineering Save Us from Global Warming? ". Protesters claim geoengineering is already taking place with chemical spraying (via persistant jet trails also known as "chemtrails") while Mr. Robock argues they are confused with normal contrails that produce cirrus clouds.

Alan Robock is funded by the US National Science Foundation, to evaluate "the efficacy and possible consequences of proposals to reduce incoming solar radiation to counteract global warming by injecting aerosol particle into the stratosphere." Recent papers describe climate model simulations and the benefits, risks, and costs of stratospheric geoengineering.