Xinhua: U.S. Senate on Saturday approved the lifting of a quarter-century ban on offshore oil and gas drilling, a move analysts say marks a major shift in U.S. energy strategy. Senators approved a 630-billion-dollar spending bill by a 78-12 vote. House of Representatives on Wednesday approved the same bill which dropped the offshore drilling bans. The move indicates that the United States has shifted from heavy reliance on imports to a balance between imports and self-reliance in …