Jim Carlton

Apr. 04, 2008

Cities Cutting Energy Use

How are cities around the world taking steps to cut energy use? Ira talks with a journalist who looked at the nine different approaches of nine different cities to the energy problem.

energy, city planning, urban design, global warming, climate change

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Michael Pollan Talks Plants and Food

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Whale Tales

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How Humpbacks Hunt With Bubbles

Humpback whales blow bubbles around schools of fish to concentrate them for easier capture. It's called a bubble net, says David Wiley, research coordinator for Stellwagen Bank National Marine Sanctuary, and it's visible as a ring of bubbles at the surface. Now, with underwater digital tracking tags and custom visualization software, whale researchers can see what the whales are doing underwater when they're bubble-netting.

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