NASA's James Hansen has called for trials of climate skeptics in 2008 for "high crimes against humanity.” Environmentalist Robert F. Kennedy Jr. lashed out at skeptics of 2007 declaring “This is treason. And we need to start treating them as traitors” In 2009, RFK, Jr. also called coal companies "criminal enterprises" and declared CEO's 'should be in jail... for all of eternity."
In June 2009, former Clinton Administration official Joe Romm defended a comment on his Climate Progress website warning skeptics would be strangled in their beds. "An entire generation will soon be ready to strangle you and your kind while you sleep in your beds," stated the remarks, which Romm defended by calling them "not a threat, but a prediction."
In 2006, the eco-magazine Grist called for Nuremberg-Style trials for skeptics. In 2008, Canadian environmentalist David Suzuki called for government leaders skeptical of global warming to be thrown “into jail.” In 2007, The Weather Channel's climate expert called for withholding certification of skeptical meteorologists.
A 2008 report found that 'climate blasphemy' is replacing traditional religious blasphemy. In addition, a July 2007 Senate report detailed how skeptical scientists have faced threats and intimidation.
In 2007, then EPA Chief Vowed to Probe E-mail Threatening to 'Destroy' Career of Climate Skeptic and dissenters of warming fears have been called 'Climate Criminals' who are committing 'Terracide' (killing of Planet Earth) (July 25, 2007) In addition, in May 2009, Climate Depot Was Banned in Louisiana! See: State official sought to 'shut down' climate skeptic's testimony at hearing.
Many more examples provided at the above link.