The Pacific Crest Trail is one of the nation's iconic hiking routes. It stretches more than 2,600 miles between Mexico and Canada and this year a record number of people are hiking the Pacific Crest Trail. In fact, as many as 500 are expected to finish the entire trek. From member station KPLU in Seattle, Bellamy Pailthorp reports on how the experience is changing as more people do it.
This week, two U.S. airlines will be flying passengers on flights powered by biofuels for the first time. On Monday a Continental flight from Houston to Chicago used a biofuel blend made in part from algae, and Wednesday Alaska Airlines is set to fly passengers using a fuel made in part from cooking oil.
If all goes well, more airlines may start to use alternative jet fuels. But the shift is not without its challenges.