When wolves were reintroduced to Yellowstone National Park in 1995, they had dramatic impacts on parts of Northwestern United States. Decades later, a wealthy landowner wants to try a limited version of that experiment — in the Scottish Highlands. Englishman Paul Lister is hoping to see the ancient Caledonian Forest of Scotch pine, alder and mountain ash regenerated, and wildlife long absent from the Highlands return. But as happened with the Yellowstone project, he's running into strong opposition. The Highlands' rocky hills and windswept valleys, known to the Scottish as glens, are an austere, beautiful landscape. But some visitors are surprised to learn they were once heavily forested — before humans wiped out the trees to feed a voracious appetite for timber. When Lister bought a 23,000-acre estate northwest of the Scottish city of Inverness 15 years ago, he named it the Alladale Wilderness Reserve and began reviving the environment, replanting hundreds of thousands of trees in
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