Photojournalist James Nachtwey is considered by many to be the greatest war photographer of recent decades. He has covered conflicts and major social issues in more than 30 countries.

A collection of talks from creative individuals striving to bring light to some of the world's most pressing issues.

Jamais Cascio follows the threads of civilization's intended (and unintended) consequences into an unpredictable future, bringing back glimpses of a green world wired beyond our wildest dreams.

Businesses have the resources to make contributions to the collective good. Here, TED Talks on what can happen when corporations make saving the environment and helping people a priority, plus talks on how business principles might even be more effective for creating change than non-profit models.

Peter Gabriel writes incredible songs but, as the co-founder of WITNESS and TheElders.org, is also a powerful human rights advocate.

Jared Diamond investigates why cultures prosper or decline -- and what we can learn by taking a broad look across many kinds of societies.

Allan Savory works to promote holistic management in the grasslands of the world.

Philip Zimbardo was the leader of the notorious 1971 Stanford Prison Experiment — and an expert witness at Abu Ghraib. His groundbreaking work in the field of psychology explored the nature of evil, heroism and more.

David R. Dow has defended over 100 death row inmates in 20 years.

These photographers capture beautiful and sometimes sobering images, using their art to help fight for social justice.

Evgeny Morozov wants to know how the Internet has changed the conduct of global affairs, because it certainly has ... but perhaps not in all the ways we think.

Nick Hanauer is one of the world’s most provocative thinkers about our society’s growing inequality and the dire consequences it creates for our democracies.

Michael Anti (Zhao Jing), a key figure in China's new journalism, explores the growing power of the Chinese internet.

Rose George looks deeply into topics that are unseen but fundamental, whether that's sewers or latrines or massive container ships or pirate hostages or menstrual hygiene.

Music can amplify social issues and inspire people to care about new (and sometimes unexpected) topics. But can it take something as dire as climate change and make it mainstream? With artists MyVerse and Kristen Warren as an inspiring opening act, social entrepreneur Samir Ibrahim suggests hip-hop and its stars can help us move from talking abo...

Leymah Gbowee is a peace activist in Liberia. She led a women's movement that was pivotal in ending the Second Liberian Civil War in 2003, and now speaks on behalf of women and girls around the world.

Majora Carter wants to build better communities for people, right where they are.

Math whiz and baseball fan Nate Silver was mainly known for predicting outcomes in fantasy ballgames -- until his technique hit a home run calling the outcome of the 2008 election primaries.

Rebecca MacKinnon looks at issues of free expression, governance and democracy (or lack of) in the digital networks, platforms and services on which we are all more and more dependent.

Reporter Paul Lewis harnesses the power of mobile phones and social media -- innovations that are making every person a potential journalist.

Bryan Stevenson is the founder and executive director of the Equal Justice Initiative, fighting poverty and challenging racial discrimination in the criminal justice system.

As the leader of Darpana, Mallika Sarabhai is a pioneer in using dance and the arts for social change.

As a cofounder of Upworthy, and the author of "The Filter Bubble," Eli Pariser leverages technology to help build better and more democratic societies.

From AI and technological innovation to climate change, social dynamics and global transformations, the most popular TED Talks of 2024 offer insights into the issues shaping the future.

Asher Hasan's social enterprise Naya Jeevan (the name means "new life" in Urdu and Hindi) is the emerging world's first HMO for the urban, working poor.

Stephanie Busari is a journalist and editor at CNN International Digital.

Filmmaker, biologist and TED Fellow Alexis Gambis makes films grounded in fact, straddling the genres of experimental, documentary and fiction. Showing clips of his work, Gambis demonstrates how storytelling helps explain important scientific advancements and social issues -- and how it can be a lens on our own humanity. "We need more real scien...

Geoff Mulgan is director of the Young Foundation, a center for social innovation, social enterprise and public policy that pioneers ideas in fields such as aging, education and poverty reduction. He’s the founder of the think-tank Demos, and the author of "The Art of Public Strategy."

Kavita Ramdas directs the Global Fund for Women, the largest foundation in the world supporting women's human rights across all borders.

Bono, the lead singer of U2, uses his celebrity to fight for social justice worldwide: to end hunger, poverty and disease, especially in Africa. His nonprofit ONE raises awareness via media, policy and calls to action.