Second Nature, a Boston-based non-profit, works to transform higher education, fostering a healthy, just, and sustainable society.

Its vision is a

Second Nature, a Boston-based non-profit, works to transform higher education, fostering a healthy, just, and sustainable society.

Its vision is a world where all people are healthy, live in vibrant communities, and are personally and economically secure within a flourishing, sustainable life support system.

Alejandro Aravena's architectural philosophy is to "bring the community into the process." Ten years ago, when tasked with building housing for 100 families in Chile, he found inspiration in

Alejandro Aravena's architectural philosophy is to "bring the community into the process." Ten years ago, when tasked with building housing for 100 families in Chile, he found inspiration in favelas. Instead of small units in large buildings, he designed flexible "half-homes" that each family could expand. This complex problem found a simple solution through direct collaboration with the families themselves.

Aravena showcases three projects where clever rethinking led to beautiful, beneficial design. Learn more at Alejandro Aravena's website, or follow TED on Twitter and Facebook.

Marine biologist Jackie Savitz argues that restoring ocean health can help feed the planet's hungriest

Marine biologist Jackie Savitz argues that restoring ocean health can help feed the planet's hungriest people. In an eye-opening talk, Savitz reveals the dire state of global fisheries and offers smart solutions to heal them, thereby increasing food supply for all.

As Vice President for U.S. Oceans at Oceana, Jacqueline Savitz brings a unique blend of marine biology, environmental toxicology, and two decades of policy experience. This background provides Oceana with sound scientific insight and a clear environmental vision.

Ikea has significantly embraced sustainability, equipping its stores with solar panels and wind turbines, and stocking shelves with LED lighting and recycled cotton. This transformation is driven

Ikea has significantly embraced sustainability, equipping its stores with solar panels and wind turbines, and stocking shelves with LED lighting and recycled cotton. This transformation is driven by a new imperative, as Chief Sustainability Officer Steve Howard states: "Sustainability has gone from a nice-to-do to a must-do."

Howard actively promotes eco-friendly materials and practices, both internally within Ikea and to its global customer base. He also challenges other major corporations to adopt similar environmental responsibilities. (Published Oct 21, 2013)

By 2050, the global population will reach 9 billion, raising critical questions about food security.

Food security expert Dr. Evan Fraser presents his solution to the Global Food Crisis in

By 2050, the global population will reach 9 billion, raising critical questions about food security.

Food security expert Dr. Evan Fraser presents his solution to the Global Food Crisis in a whiteboard presentation.

Learn more at www.feedingninebillion.com.

Melinda Gates champions contraception as a critical international health issue. The Bill & Melinda Gates Foundation is dedicated to ensuring everyone has the opportunity to lead healthy,

Melinda Gates champions contraception as a critical international health issue. The Bill & Melinda Gates Foundation is dedicated to ensuring everyone has the opportunity to lead healthy, productive lives.

This page features videos, including content from the TEDx program, highlighting the Foundation's work in global health, global development, and U.S. education.

For more, visit the Foundation's YouTube channel for Global Health Stories.