Anti-nuclear activist Dr. Helen Caldicott discusses renewable energy as an alternative to nuclear power. This content is excerpted from her talk at The Sanctuary for Independent Media in Troy, NY,

Anti-nuclear activist Dr. Helen Caldicott discusses renewable energy as an alternative to nuclear power. This content is excerpted from her talk at The Sanctuary for Independent Media in Troy, NY, on November 13, 2010.

Learn more about Dr. Caldicott at helencaldicott.com.

The original material was uploaded on November 29, 2010.

On March 14, 2013, Dr. Helen Caldicott addressed over 150 people at the Princeton

On March 14, 2013, Dr. Helen Caldicott addressed over 150 people at the Princeton United Methodist Church. The event was sponsored by the Princeton Coalition for Peace and several other organizations.

During her passionate 60-minute discussion, Dr. Caldicott covered critical topics. She spoke on the abolition of nuclear weapons and power plants, the dire impacts of global warming, and updates on radiation effects from Fukushima, Japan.

Dr. Caldicott concluded by emphasizing the urgent need for individuals to become more politically active to address these global challenges.

British philosopher John Gray visited the RSA to discuss his new book, 'The Silence of Animals.' Published on April 9, 2013, this much-anticipated

British philosopher John Gray visited the RSA to discuss his new book, 'The Silence of Animals.' Published on April 9, 2013, this much-anticipated work is the sequel to his best-selling 'Straw Dogs.'

To order 'The Silence of Animals,' please visit your local bookstore or purchase it online here.

Photographer Daniel Beltra offers insight into his experience documenting the Gulf oil spill and his ongoing motivation to capture our changing environment. His interview on "ICE," uploaded August

Photographer Daniel Beltra offers insight into his experience documenting the Gulf oil spill and his ongoing motivation to capture our changing environment. His interview on "ICE," uploaded August 4, 2010, is available here. Explore more of his work on his website.

Beltra was also shortlisted for the Prix Pictet, the global award in photography and sustainability, for his powerful series, "Spill."

This video explains the Hydrologic Cycle, also known as the Water Cycle, through animation, graphics, and video clips. It illustrates key "flow" and "storage" processes, including precipitation,

This video explains the Hydrologic Cycle, also known as the Water Cycle, through animation, graphics, and video clips. It illustrates key "flow" and "storage" processes, including precipitation, interception, runoff, infiltration, percolation, groundwater discharge, evaporation, transpiration, evapotranspiration, and condensation.

Published on July 12, 2013.

Kansas farmers, including Stan Townsend and Mitchell Baalman, are depleting the Ogallala aquifer—North America's largest freshwater aquifer—for crop irrigation. Water is being pumped

Kansas farmers, including Stan Townsend and Mitchell Baalman, are depleting the Ogallala aquifer—North America's largest freshwater aquifer—for crop irrigation. Water is being pumped significantly faster than natural replenishment.

Michigan State University scientist David Hyndman is developing a management plan to ensure sustainable farming practices and protect this vital resource.

Lake Erie, part of Earth's largest surface freshwater system, provides drinking water for 11 million people. Its water quality is threatened by increased fertilizer-derived

Lake Erie, part of Earth's largest surface freshwater system, provides drinking water for 11 million people. Its water quality is threatened by increased fertilizer-derived nutrients.

Researchers Anna Michalak, Tom Bridgeman, and Pete Richards are studying how farming practices and severe weather contribute to these nutrient levels, which diminish water quality and threaten the lake's ecosystem and public health. This research was published on July 12, 2013.

The Rocky Mountains supply water to over 60 million homes in the West. However, this vital watershed is endangered by the mountain pine beetle.

Scientists Reed Maxwell of Colorado School of

The Rocky Mountains supply water to over 60 million homes in the West. However, this vital watershed is endangered by the mountain pine beetle.

Scientists Reed Maxwell of Colorado School of Mines and John Stednick of Colorado State University are collaborating to study the insect's impact on regional water quantity and quality.

Sierra Nevada snowmelt is vital for California. It provides drinking water for 30% of residents, irrigates key San Joaquin Valley crops, and powers hydroelectric plants supplying 15% of the

Sierra Nevada snowmelt is vital for California. It provides drinking water for 30% of residents, irrigates key San Joaquin Valley crops, and powers hydroelectric plants supplying 15% of the state's electricity.

Scientists Martha Conklin and Tom Harmon (UC Merced) are researching at the Southern Sierra Critical Zone Observatory. They use wireless sensors to accurately measure snowpack and melt, enabling state water managers to make better allocation decisions for this precious resource.

Los Angeles, with nearly 10 million residents, depends on imported snowmelt from the distant Eastern Sierra Nevadas and Rocky Mountains for its water supply.

UCLA researchers Stephanie

Los Angeles, with nearly 10 million residents, depends on imported snowmelt from the distant Eastern Sierra Nevadas and Rocky Mountains for its water supply.

UCLA researchers Stephanie Pincetl and Mark Gold are studying how the city can reduce these imports. Their work focuses on enhancing local water capture, storage, and reuse to establish a more sustainable water system for the region.