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The world is addicted to oil, and the race is on to find new sources. Nowhere is the battle more intense than in Alaska; source of nearly 15 percent of Americas domestic production, and home to the nations largest wildlife preserve, the Arctic National Wildlife Refuge (ANWR). Now that neighboring oil fields are drying out, companies are pushing to drill in the ANWR. Explorer takes a close look at the ANWR to examine how much longer it can remain off-limits.