Reuters: California Gov. Arnold Schwarzenegger on Friday ordered preparations for rising sea levels from global warming, a startling prospect for the most populous U.S. state with a Pacific Ocean coastline stretching more than 800 miles. Recorded sea levels rose 7 inches during the 20th century in San Francisco, Schwarzenegger said in the executive order for study of how much more the sea could rise, what other consequences of global warming were coming and how the state should …