Most disasters come with heart-breaking visuals — innocent victims, burned wreckage. Our looming water disaster is invisible. Will anyone notice before it’s too late?


Extreme hiker Sarah Marquis explains how pain gives way to pleasure during a 500-mile trek through the wilderness.

Alice Moynihan for TED

On a typical sunny day in the Amazon, 20 billion metric tons of water pass through the trees and into the air. This is more than just a feat of Nature — it’s at the heart of South America’s economy, as researcher Antonio Donato Nobre explains.


Human beings have made enormous changes to Earth, reshaping it, developing it and generally altering it so much that in many cases its pre-human condition has become unrecognizable. In this far-ranging conversation, ecologist Erle Ellis and landscape architect Bradley Cantrell discuss what this means for ecology and architecture … and how we might think about protecting our planet.

Explorer Brent McGregor shares stunning photographs of glacier caves discovered within the Sandy Glacier on Oregon’s Mount Hood.


Biologist Carin Bondar shares videos and books about animals getting down and dirty.


At the end of 2014, find repose by exciting the mind. 52 of the world’s leading thinkers offer the books that inspired them and their work.