Ali Partovi is recognized as one of "Silicon Valley's top angel investors," having been involved early with both Facebook and Dropbox.

He is a passionate advocate for sustainable food

Ali Partovi is recognized as one of "Silicon Valley's top angel investors," having been involved early with both Facebook and Dropbox.

He is a passionate advocate for sustainable food systems, serving on the board of FoodCorps, a non-profit dedicated to improving school food sourcing and education. Partovi also invests in ventures like BrightFarms, Farmigo, and the Farmland LP real estate fund to scale resource-efficient farming techniques.

Hilary Wiech of Sailors for the Sea highlights the Clean Regattas program, an initiative dedicated to ocean conservation. This program implements actions such as eliminating plastic water bottles

Hilary Wiech of Sailors for the Sea highlights the Clean Regattas program, an initiative dedicated to ocean conservation. This program implements actions such as eliminating plastic water bottles at regattas, providing environmental education for junior sailors, and collaborating with industry on sustainability best practices.

Clean Regattas was featured at the 2011 U.S. Team Racing Championship. Learn more about the program by visiting the Sailors for the Sea website.

Times Documentaries presents one man's challenging journey to secure health insurance in the era of the Affordable Care Act.

Produced by Emma Cott, John Woo, and Abby Goodnough. Read the

Times Documentaries presents one man's challenging journey to secure health insurance in the era of the Affordable Care Act.

Produced by Emma Cott, John Woo, and Abby Goodnough. Read the full story here.

Published on June 20, 2015. Subscribe to the Times Video newsletter for a free, handpicked selection of the best videos weekly: http://bit.ly/timesvideonewsletter

Bestselling author and political adviser Jeremy Rifkin investigates the evolution of empathy and its profound impact on our development and society. This content is from a lecture given as part of

Bestselling author and political adviser Jeremy Rifkin investigates the evolution of empathy and its profound impact on our development and society. This content is from a lecture given as part of the RSA's free public events program, uploaded on May 6, 2010.

Watch the full lecture here. Find out more about the RSA and join them on Facebook.

Beyond terrestrial climate change, oceans face significant threats. They absorb a quarter of all greenhouse gases, fundamentally altering their chemistry. This causes severe problems for marine

Beyond terrestrial climate change, oceans face significant threats. They absorb a quarter of all greenhouse gases, fundamentally altering their chemistry. This causes severe problems for marine ecosystems.

Such changes ultimately jeopardize the billions who depend on oceans for food and livelihood, diminishing their vital beauty. This information was published on March 23, 2015, by Grist, described as "a Beacon in the smog."

Explore more from Grist on YouTube.

This video, uploaded May 1, 2011, draws inspiration from the Universal Declaration of Mother Rights. Proclaimed in 2010 at the World People's Conference on Climate Change and the Rights of Mother

This video, uploaded May 1, 2011, draws inspiration from the Universal Declaration of Mother Rights. Proclaimed in 2010 at the World People's Conference on Climate Change and the Rights of Mother Earth in Cochabamba, Bolivia, the declaration's Preamble and Articles 1 and 2 are read in the video.

Access the full text of the [Universal Declaration of Mother Rights](http://therightsofnature.org/universal-declaration/).

The Prince's Foundation for the Built Environment is an educational charity, established by The Prince of Wales. It champions placing people at the

The Prince's Foundation for the Built Environment is an educational charity, established by The Prince of Wales. It champions placing people at the heart of architectural design, teaching and practicing timeless, ecological methods of planning, designing, and building.

This film provides further insight into the charity and its projects, featuring interviews with Chief Executive Hank Dittmar and Ambassador George Clarke.

Studies indicating historical CO2 levels lag behind temperature have merit, confirms Peter Hildebrand, Director of Earth Science at NASA's Goddard Space Flight Center. Responding to a question on

Studies indicating historical CO2 levels lag behind temperature have merit, confirms Peter Hildebrand, Director of Earth Science at NASA's Goddard Space Flight Center. Responding to a question on Twitter, Hildebrand explained that in the pre-industrial age, temperature changes drove CO2 levels; a warmer climate caused the biosphere to emit more CO2.

However, in the post-industrial era, this dynamic has reversed. Now, increasing atmospheric CO2 is leading to higher temperatures, indicating a fundamental shift in the physical-biological processes. For more information, visit Ask A Climate Scientist.

Robert Reich and Mark Zandi debated Glenn Hubbard and Arthur Laffer on the topic: "The Rich Are Taxed Enough." Moderated by John Donvan, the discussion addressed how to fix the U.S.

Robert Reich and Mark Zandi debated Glenn Hubbard and Arthur Laffer on the topic: "The Rich Are Taxed Enough." Moderated by John Donvan, the discussion addressed how to fix the U.S. economy.

With a nearing trillion-dollar budget deficit and high unemployment, the expiring Bush-era tax cuts presented a critical economic challenge. President Obama advocated raising taxes on incomes over $250,000 to reduce the deficit. Conversely, others argued the wealthiest 1% already pay over a quarter of federal taxes, and higher taxes on "job creators" would hinder economic growth. The central question remained: should tax breaks be extended for everyone, or are the wealthy not paying their "fair share"?

Published on Nov 17, 2014, an ultra-high-resolution NASA computer model, GEOS-5, offers a stunning new look at global carbon dioxide movement. This "Nature Run" simulation visualizes CO2 plumes

Published on Nov 17, 2014, an ultra-high-resolution NASA computer model, GEOS-5, offers a stunning new look at global carbon dioxide movement. This "Nature Run" simulation visualizes CO2 plumes swirling with winds, their dispersion from sources, hemispheric differences, and seasonal swings in concentrations due to plant growth cycles.

Developed by scientists at NASA Goddard Space Flight Center's Global Modeling and Assimilation Office, the model ingests real data on atmospheric conditions and emissions. It then simulates Earth's atmosphere, specifically for 2006. An updated version of this simulation was released to the scientific community in fall 2014. The video is public domain and available for download here.