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  • Drugs in Our Drinking Water: You Heard It Here First

  • How to Plant Trees

    One seedling at a time, it's possible to change the world.
  • Invasion of the Alien Creatures

    Ecologists estimate that every six months a new invasive species begins carving out a spot for itself in the Great Lakes ecosystem.
  • Letters from Our Readers: Spring 2008

    Readers write in about corporate environmentalism, environmental action and more.
  • Meet Joe Butterfly

    University of Florida biologists George Austin and Andrew Warren had an idea: auction off the naming rights to a newly discovered owl butterfly and use the money for conservation research.
  • Requiem for a River

    Once upon a time there was enough water in the Colorado for everyone to have a share of its bounty. Not anymore. A journey down the once-mighty river reveals the future of the American West in a changing climate.
  • The Carbon Exchange

    In the carbon cycle, it's not just about the individual tree-the entire forest plays a role. Leaves take in carbon dioxide, converting it to sugar, which is carbon-based. Some of the sugar is used immediately for energy, converted back to CO2, and released into the atmosphere. The rest is stored in living wood or dead matter, such as fallen leaves and branches. Old-growth forests, in particular, store vast amounts of carbon while continuing to absorb CO2.
  • The Giving Trees

    We value our ancient forests in so many ways: for wild creatures, for spiritual renewal, for profitable timber. But science and economics may be converging to make forests a vital asset in the fight against global warming.
  • Warmer Temperatures Threaten Grizzly Food

    Louisa Willcox wistfully recalls the day she and three friends were hiking in Wyoming, not far from Yellowstone, when they stumbled upon a giant whitebark pine.
  • Why I Still Believe in the Zoo

    One unusually warm day in November, I took my 10-year-old daughter, Moriah, to the San Francisco Zoo.

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