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Tree sitting has become an increasingly common form of environmental protest. In southern California, a professional tree sitter is occupying a 400-year-old oak, trying to stop the bulldozers. In northern California, a whole sub-culture has arisen to serve the dozens of people sitting in trees. Reporter Jason Margolis climbed a tree near Freshwater, Calif.

A Lancet medical journal report finds that human-caused climate change is worsening human health in just about every measurable way. It calls for more urgent action from world leaders.

President Bush proposes more than $1 billion over the next five years to develop advanced automotive technologies, including environmentally friendly cars powered by hydrogen fuel cells. NPR's Bob Edwards talks to Dan Sperling of the University of California, Davis.

NPR's Andy Bowers reports that naturalist John Muir is back. Or so it seems. A man who has played Muir on stage for decades has just become a California county supervisor representing the Yosemite Valley... where he plans to take up Muir's environmentalist causes against a slate of property rights advocates.

The home-improvement chains Home Depot and Lowe's seek to fulfill promises to environmentalists to protect and sustain supplies of the lumber they sell. The business rivals are tracking the lumber to its source, seeking to reduce the impact on endangered forests. NPR's Robert Smith reports.

Something was "fishy" at last summer's bass tournament in Monticello, Ind. Would-be champion angler Danny Engleking pleaded guilty this past week to using substitute fish from an underwater cage. Host Steve Inskeep speaks with environmental officer John Raines, who hooked Engleking in a videotaped sting operation.

DuPont and other multinational corporations announce the launch of the Chicago Climate Exchange. The effort is the first major attempt at establishing a market for cutting greenhouse gas emissions. NPR's Robert Siegel talks to Andrew Aulisi, a policy analyst with Environmental Defense.

In the 1980s and 1990s, asthma rates in U.S. kids reached epidemic proportions. Though studies indicate the rates are leveling off, rates for African American and Hispanic children and inner-city populations aren't declining. New research suggests poverty, stress and poor mental health may be fueling the problem. Madge Kaplan of member station WGBH reports.

On Fridays, kids and parents hop on their bikes and join the bicibús, or bike bus, traveling to three schools along its route. It promotes bike safety and environmentally friendly transportation.

During the 1991 Gulf War, retreating Iraqi troops blew up and set ablaze many of Kuwait's oil fields, leaving massive oil spills and an environmental disaster. Now some military analysts say a desperate Saddam Hussein could once again attack Kuwait's oil fields -- or wreck his own to try to slow any U.S. attack. NPR's Eric Westervelt reports.