The Arctic could become the next great international battleground for resources, with melting icecaps opening new shipping routes, fishing grounds and, most significantly, some of the world's richest and as yet unexplored oil and gas deposits.
So far, the United States, Russia and other nations near the North Pole are trying to work together. They'll take a baby step in that direction this week by agreeing to the first international treaty covering the Arctic Sea, a coordinated search-and-rescue pact that will grow in importance as more cargo and cruise ships start navigating the cold waters.