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"FAYETTEVILLE, West Va.-Perched on a platform 50 feet above the ground in a big hemlock named Fern, Geoff Elliott points to an unwelcome Asian import: a little bug known as the hemlock woolly adelgid. Small fuzzy white nymphs cling to the undersides of hemlock branches throughout the grove of trees. Both nymphs and adult adelgids can work quickly to destroy hemlocks 150 feet tall. "This tree is believed to be somewhere between 200 and 300 years in age and can be taken out by the adelgid in as little as two to four years," says Mr. Elliott, a tour guide for Adventure West Virginia Resort LLC, which operates zip-line tours through the treetops. The company is trying to educate visitors about the dangers of the invasive insect as it diminishes the landscape the business relies on. "Without any action we could lose the species," said Mark Whitmore, a forest entomologist at Cornell University. He described the hemlock as a "keystone species," because it provides shade that cools streams so fish can survive as well shelter for birds and animals. Losing it would be like "having all your front teeth fall out," he said. As global trade has mounted, more goods are coming in from overseas, sometimes bringing with them the accidental cargo of destructive bugs and plants. An estimated 500 million plants are imported to the U.S. each year, and shipments through one plant inspection station doubled to 52,540 between 2004 and 2006, according to the U.S. Department of Agriculture. Today, about 30 new invasive insects are discovered annually in the U.S., up sharply over the last decade, the USDA says. "

"The State Department is planning to welcome thousands of immigrants from terror-watch list countries into the United States this year through a "diversity visa" lottery -- a giant legal loophole some lawmakers say is a "serious national security threat" that has gone unchecked for years. Ostensibly designed to increase ethnic diversity among immigrants, the program invites in thousands of poorly educated laborers with few job skills -- and that's only the beginning of its problems, according to lawmakers and government investigations. "There are a lot of holes in this program in terms of security and in terms of fraud," said Rep. Bob Goodlatte, R-Va., who has written legislation aimed at killing the lottery. Now, in the wake of the botched Christmas Day terror attack that emerged from Nigeria and Yemen, members of Congress are worried the system could be vulnerable to radicals looking to "play" the visa lottery as a means of reaching the U.S. Here's how it works: to avoid getting stuck with 3.5 million others on a visa waiting list, hundreds of thousands of people put their names into the separate diversity lottery, which rewards countries that typically see low levels of immigration to the U.S. Immediate family are allowed to join lottery winners. Countries like China, where lots of immigrants originate, are excluded. Then a computer in Kentucky picks names at random from the qualified applicants, who need only a high school degree or two years at a job that requires two years of experience. The program accounts for about 10 percent of all immigrant visas each year. Included in the lottery are all four countries the U.S considers state sponsors of terror -- Iran, Sudan, Cuba, and Syria -- and 13 of the 14 nations that are coming under special monitoring from the Transportation Security Administration as founts of terrorism. Pakistan is excluded because, like China, it sends over tens of thousands of immigrants each year and doesn't need to be in the lottery