http://www.csmonitor.com/2003/0610/p01s03-usgn.html International drug cartels dominated by Mexicans pose the greatest threat to U.S. national parks since their creation more than a century ago, the Christian Science Monitor says. It is illegal marijuana farming. Bill Tweed, chief naturalist at Sequoia National Park in California, says that growers are "killing wildlife, diverting streams, introducing nonnative plants, creating fire and pollution . . .
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