Reuters: So far, 2010 is tied for the warmest year on record, and Arctic sea ice reached its third-lowest level, prompting thousands of walruses to haul themselves out of ice-starved waters, U.S. scientists said on Wednesday. The first eight months of the year match the record set for the same period in 1998 for the highest combined land and ocean surface temperatures worldwide, at 58.5 degrees F (14.7 C), 1.21 degrees F (0.67 degrees C) above the 20th century average, the U.S. National …