Clark University 2014

"The Anthropocene and its Discontents: Ponder the Future of Civilization in the Face of Climate Change"

Clark University 

February 13, 2014

Nanotechnology World Wide Town Hall X

Northwestern University 

October 15, 2013

"Climate Preparedness"

Garrison Institute

June 24, 2013

"What is Fracking?"

Lawrence Berkeley Lab

November 15, 2012

"The Question of Nature: A Geological Perspective on Human-Induced Climate Change"

Harvard Graduate School of Arts and Sciences

April 26, 2012

"Confronting the Climate-Energy Challenge"

University of Rhode Island

February 24, 2010