Host Philippe Cousteau looks at ways scientists are measuring the health of our forests. In New England, Philippe visits a white pine forest that is being threatened by invasive plants. At the University of California - Santa Cruz, students use sonic-tomography to look inside trees in order to detect any signs of disease. At the Pine Barrens of New Jersey, we learn about the pitch pine tree.
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- Ch 403Coolest Places on EarthWe check out the wonders and wilds of Western Canada and the Territories, from the man-made heights of Vancouver skyscrapers to the majestic peaks of Banff National Park.Coolest Places on EarthPack your trunks; we're driving through the North Country. From Seward, Alaska, to Ketchikan, Alaska with Canada in between. The historic Alaska-Canada Highway will take us through places like the Kluane National Park.