It is incredibly frustrating when green activists and even mainstream news media complain about Republican use of junk science when those very same activists freely engage in junk [economic] science. In an Op-Ed in the NY Times recently, James Hansen--a leading advocate for curbing carbon emissions said that "Economic losses [of tar sand oil] would be incalculable". This is blatantly wrong and ignorant of most economic studies done by people that have been doing the calculations of the economic losses due to climate change for years, which are substantial but not catastrophic. See Tol (2009) for a review paper, or the many studies led by Nordhaus and others. Hysterical exaggeration and junk science are typical from all sides.