RealClimate, Ben Santer: A Eulogy to Stephen Schneider [includes some pot shots at climate realists]

His voice was clear and consistent, despite serious illness, and despite encountering vocal opposition by powerful forces – individuals who seek to make policy on the basis of wishful thinking and disinformation rather than sound science.
...without the courage of leaders like Stephen Schneider, the world would not be on the threshold of agreeing to radically change the way we use energy. We would not be on the verge of a global treaty to limit the emissions of greenhouse gases.
...We honor Steve by raising our voices, and by speaking out when powerful “forces of unreason” seek to misrepresent our science.

Renowned Climate-Change Scientist Dies - The Bay Citizen

He believed in an activist role for the climate scientist: He made appearances on shows from Johnny Carson's "The Tonight Show" to "Good Morning America" and published a string of books on the subject.

He also maintained a website, “Mediarology,” that urged scientists to go out and “debunk climate change myths” and chastised journalists for creating artificial balance and giving voice to deniers of global warming.

He was a central figure in the United Nations’ Intergovernmental Panel on Climate Change, which shared the 2007 Nobel Peace Prize with Al Gore.

In the past year in particular, Schneider received a barrage of hate mail and even death threats from extremists who reject the powerful — though inconclusive — evidence that accelerating global warming is a largely human-driven phenomenon.
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“He really got on the nerves of these climate skeptics because he was very vocal and bringing the truth,” said Mark Z. Jacobson, an atmospheric scientist at the Woods Institute for the Environment, where Schneider worked.

Climate Scientist-Activist Stephen Schneider Has Died - ScienceInsider

An indefatigable advocate of the truth in climate science with all its uncertainties made plain, Schneider had been globetrotting for almost 40 years in his campaign to save the planet.
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... "I am an activist," he told The New Republic last November. "I want the world to be a better place. ... What to do about what we know—that's a question of values. But it's values informed by science."

Climate Change Expert Stephen Schneider Dies : NPR

Michele Norris talks to John Holdren, science adviser to President Obama. Holdren was a friend and colleague to Schneider for almost 40 years, working with him to educate the public about climate change.