![]() Meanwhile from the late 20th century the resources and environment problems have spread our interests over the polar regions and oceans such as, (1) Sea ice around the North pole representing the global warming, (2) Territorial sea claims for marine resources, (3) An ozone hole above the South Pole, (4) Melting glaciers in Greenland, a cause that may submerge Tuvalu, (5) El Nino in the ocean, a cause of an unusual weather that eventually influence to the economy on land. Our interest has been mainly on land since it has been our living environment. In the 20th century the world tended to be framed by the East-West relations and the North-South problem. AuthaGraph World Map Antarctica was found in 1820 and the first man reaches the North Pole in 1909.
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