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When Europeans first came to the U.S. as settlers, there were roughly a billion acres of ancient forests. America's trees have been under assault ever since. Westward expansion, industrialization, rapid population growth, the rise of the suburbs and various diseases have all exacted a toll. Today woodland acreage is down by about 25 percent - and much of it is populated with young trees. A new book tells the history of America through its trees. Like Dr. Seuss's environmental classic "The Lorax," it's a sad story, but one that's not without hope. In the next segment of our Environmental Outlook series - trees, forests and the making of a nation.
World leaders meet for the UN climate change summit in Paris to discuss plans for reducing carbon emissions. What's at stake for the talks, and prospects for a major agreement.