David Keith reviews the science and technology of solar geoengineering, addressing the following Q’s: how effective could it be in reducing climate risks? What new risks does it entail? What

David Keith reviews the science and technology of solar geoengineering, addressing the following Q’s: how effective could it be in reducing climate risks? What new risks does it entail? What is uncertain? And, finally, how could uncertainty be reduced to a substantial research program? He presents a case for integrating solar geoengineering into a 4D climate policy that includes emissions cuts, carbon removal, and adaptation.

David Keith has worked near the interface between climate science, energy technology, and public policy since ’91. He took first prize in Canada’s national physics prize exam, won MIT’s prize for excellence in experimental physics, and was one of TIME Magazine’s Heroes of the Environment. David is Professor of Applied Physics at the Harvard School of Engineering and Applied Sciences and Professor of Public Policy at the Harvard Kennedy School, and founder of Carbon Engineering, a Canadian company developing technology to capture CO 2 from ambient air to make carbon-neutral hydrocarbon fuels. Best known for his work on the science, technology, and public policy of solar geoengineering, David led the development of Harvard’s Solar Geoengineering Research Program, a Harvard-wide interfaculty research initiative. His work has ranged from the climatic impacts of large-scale wind power to an early critique of the prospects for hydrogen fuel. David’s hardware engineering work includes the first interferometer for atoms, a high-accuracy infrared spectrometer for NASA’s ER-2, the development of Carbon Engineering’s air contactor and overall process design, and the development of a stratospheric propelled balloon experiment for solar geoengineering. He teaches science and technology policy, climate science, and solar geoengineering. David is the author of over 200 academic publications with a total citation count of over 13,000. He has written for the public in op-eds and A Case for Climate Engineering.

Moderated by Greg Bronevetsky.

#geoengineering #climatescience #solarengineering

David Korten, author of "Agenda for a New Economy," presented at the 39th Trinity Institute National Theological Conference. His address explored "Radical Abundance: A Theology of

David Korten, author of "Agenda for a New Economy," presented at the 39th Trinity Institute National Theological Conference. His address explored "Radical Abundance: A Theology of Sustainability."

Learn more about David Korten at davidkorten.org. His book, "Agenda for a New Economy," can be ordered from Amazon.com.

David W. Orr is the Paul Sears Distinguished Professor of Environmental Studies and Politics and Special Assistant to the President at Oberlin College. He also holds a James Marsh Professorship at

David W. Orr is the Paul Sears Distinguished Professor of Environmental Studies and Politics and Special Assistant to the President at Oberlin College. He also holds a James Marsh Professorship at the University of Vermont.

Orr is the author of *The Nature of Design* (Oxford, 2002) and *Design on the Edge* (MIT, 2006).

His recent work includes a two-year, $2 million project to define a 100-day climate action plan for the Obama administration. Learn more at www.climateactionproject.com.

You don't have to be a scientist to help protect the world's oceans, says underwater drone expert and TED Fellow David Lang -- in fact, ordinary citizens have pulled together to save the planet's

You don't have to be a scientist to help protect the world's oceans, says underwater drone expert and TED Fellow David Lang -- in fact, ordinary citizens have pulled together to save the planet's natural treasures many times in history. Lang asks us to take a lesson from the story of the US National Parks Service, offering a three-point plan for conserving underwater wonders.

Check out more TED Talks: http://www.ted.com

Founder David Katz, Co-Founder Shaun Frankson, and plastics expert Mike Biddle were interviewed in Victoria, BC. They discussed The Plastic

Founder David Katz, Co-Founder Shaun Frankson, and plastics expert Mike Biddle were interviewed in Victoria, BC. They discussed The Plastic Bank's mission to reduce global poverty and plastic waste.

This interview was published on August 20, 2013.

"Seven Sacred Laws" is an inspiring documentary that explores the ancient universal values of the Anishinaabe People of Turtle Island (North America). Director Nihad Ademi, in this follow-up to

"Seven Sacred Laws" is an inspiring documentary that explores the ancient universal values of the Anishinaabe People of Turtle Island (North America). Director Nihad Ademi, in this follow-up to his award-winning bio-doc "White Balloon," presents these laws as essential guideposts for human conduct and fostering a deeper relationship with Mother Earth.

Featuring breathtaking prairie footage and interviews with Indigenous elders Dave Courchene Jr and Florence Paynter, the film helps viewers redefine their identity and direction amidst today's growing conflicts, dislocation, and environmental challenges.