The film is almost entirely composed of aerial shots of various places on Earth. It shows the diversity of life on Earth and how humanity is threatening the ecological balance of the planet.The documentary chronicles the present day state of the Earth, its climate and how we as the dominant species have long-term repercussions on its future. A theme expressed throughout the documentary is that of linkage—how all organisms and the Earth are linked in a "delicate but crucial" natural balance with each other, and how no organism can be self-sufficient.

Nandan Nilekani, visionary CEO of outsourcing pioneer Infosys, explains four brands of ideas that will determine whether India can continue its recent breakneck progress.

The "dismal science" truly shines in this optimistic talk, as economist Alex Tabarrok argues free trade and globalization are shaping our once-divided world into a community of idea-sharing more healthy, happy and prosperous than anyone's predictions.

This demo -- from Pattie Maes' lab at MIT, spearheaded by Pranav Mistry -- was the buzz of TED. It's a wearable device with a projector that paves the way for profound interaction with our environment. Imagine "Minority Report" and then some.

In this TED archive video from 1998, paralympic sprinter Aimee Mullins talks about her record-setting career as a runner, and about the amazing carbon-fiber prosthetic legs (then a prototype) that helped her cross the finish line.

Batch to batch, crust to crust ... In tribute to the beloved staple food, baking master Peter Reinhart reflects on the cordial couplings (wheat and yeast, starch and heat) that give us our daily bread. Try not to eat a slice.

In a lively show, mathemagician Arthur Benjamin races a team of calculators to figure out 3-digit squares, solves another massive mental equation and guesses a few birthdays. How does he do it? He’ll tell you.

Anand Agarawala presents BumpTop, a user interface that takes the usual desktop metaphor to a glorious, 3-D extreme, transforming file navigation into a freewheeling playground of crumpled documents and clipping-covered "walls."

With stunning photos and stories, National Geographic Explorer Wade Davis celebrates the extraordinary diversity of the world's indigenous cultures, which are disappearing from the planet at an alarming rate.

We know the negative images of Africa -- famine and disease, conflict and corruption. But, says Ngozi Okonjo-Iweala, there's another, less-told story happening in many African nations: one of reform, economic growth and business opportunity.

In this brand-new slideshow (premiering on TED.com), Al Gore presents evidence that the pace of climate change may be even worse than scientists recently predicted. He challenges us to act.

In an emotionally charged talk, MacArthur-winning activist Majora Carter details her fight for environmental justice in the South Bronx -- and shows how minority neighborhoods suffer most from flawed urban policy.