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The unusual climate change idea

Environmental scientist David Keith proposes a cheap, effective, shocking means to address climate change: What if we injected a huge cloud of ash into the atmosphere to deflect sunlight and heat?Keith studies our climate, and the many ideas...

The ancient ingenuity of water harvesting

With wisdom and wit, Anupam Mishra talks about the amazing feats of engineering built centuries ago by the people of India’s Golden Desert to harvest water. These structures are still used today — and are often superior to modern water...

Eco-friendly drywall

Kevin Surace suggests we rethink basic construction materials, such as the familiar wallboard, to reduce the huge carbon footprint generated by the manufacturing and construction of our buildings. He introduces EcoRock, a clean, recyclable and...

How to make filthy water drinkable

Too much of the world lacks access to clean drinking water. Engineer Michael Pritchard did something about it: inventing the portable Lifesaver filter, which can make the most revolting water drinkable in seconds. With cutting-edge nanotech,...

Bill Ford: A future beyond traffic gridlock

A future beyond traffic gridlock: Bill Ford is a car guy – his great-grandfather was Henry Ford and he grew up inside the massive Ford Motor Company. So when he worries about cars’ impact on the environment and about our growing global gridlock...

The economic injustice of plastic

Van Jones lays out a case against plastic pollution from the perspective of social justice. Because plastic trash, he shows us, hits poor people and poor countries ‘first and worst’, with consequences we all share no matter where we live and what...