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Critical List: Australia will tax carbon; U.S. cars kill 32.5 trillion insects each year

This is a carbon tax: Australia is going to put a tax of $23 per metric ton on carbon emissions from 500 companies.

Hybrids and electric vehicles may no longer be legally allowed to slink quietly down the street, surprising pedestrians and dogs everywhere. The National Highway Traffic Safety Administration is proposing a rule requiring that the near-silent cars emit some sort of sound at low speeds.

The EPA is not happy with ExxonMobil and the company's plan to clean up the Yellowstone River. I mean, it’s in favor of cleaning up, it just thinks this particular plan stinks.

Unwet and wild: Ask Umbra on dry shampoo

Dry shampoo is the latest hair-care craze. Ask Umbra investigates the tangled truth.

It's World Population Day! Celebrate by stealing a baby seat & leaving a condom [VIDEO, NSFW]

If you like lewd, crude overpopulation humor, Doug Stanhope is your man.

What does the volatile past of natural gas tell us about its future?

Natural gas is on the rise, partly because it's cleaner than other fossil fuels. But do the climate benefits justify the costs of fracking?

Can Florida's nature and people outrace sea-level rise?

Laura Geselbracht talks about what sea-level rise is doing to Florida's Gulf Coast.

Industrialized countries are now losing the clean energy race

Developing countries now lead investment in clean energy -- representing about $72 billion in spending in 2010, versus $70 billion in rich countries.

Feminist icon Gloria Steinem on climate change, population, & deep ecology [VIDEO]

Who knew feminist Gloria Steinem was such a environmentalist? On ABC News, she talks about climate change, population, ecofeminism, and deep ecology.

A discussion of clean energy innovation, with me, and beer [VIDEO]

Grist and energyNOW held a cleantech panel featuring McKinstry's Dean Allen, Ross Macfarlane of Climate Solutions, Bill Rebozo, and David Roberts.

McDonalds and United Arab Emirates greener than America?

Everyone loves a “man bites dog” story. Not everyone likes those tales, however, if they embarrass someone in the process. Take the news out of the oil-rich United Arab Emirates, where fast food giant McDonalds has just announced that they will fuel their delivery trucks with bio-diesel made from their own used vegetable oil. Neutral […]

Cities safer than ever, and the more diverse the better

New data shows that, contrary to popular belief, crime is falling faster in urban areas, and diverse and immigrant populations are a key factor.