John Muir and Gifford Pinchot represent the two strains of environmentalism in the United States -- and most of us think like both of them. We want nature pristine and undisturbed, but we also rely on its resources and understand the need to use care in extracting them.
It's home-grown, plentiful, and touted as the best way to wean the US off Mideast oil. But there are limits to how far the US can tilt toward a natural gas economy.
A host of companies and nonprofits are using technology – from smartphones to social networking – to make it easier for consumers to choose environmentally friendly products.
More than a billion people worldwide lack access to electricity. The best way to bring it to them is to provide ever-cheaper, clean, locally produced solar power that can replace dirty and dangerous kerosene.
ICANN, the group that manages the use of Internet suffixes such as '.com,' has announced that next year, websites can make their own suffixes. With a big fee involved, not everyone will do it, but the move could unleash reams of new suffixes on web surfers.