During the Bush Administration there were claims made that supporters of global warming were being muzzled. James Hansen made those claims repeated even as he traveled the globe and made hundreds of speeches warning of the pending climate disaster if his recommended policy of curtailing carbon emissions were not adopted. It was sort of a joke that he claimed he was being muzzled even as he spoke out. He even testified at a trial in England that people are justified in vandalizing coal burning power plants. Now the Obama Administration, which promised to be the most transparent in history, is actively muzzling those who disagree with Administration policy. No surprise there.