The Group of Eight (G8) industrial powers were meeting with China, India and South Korea in northern Japan on Sunday amid deepening worries over record oil prices.  Energy ministers from the G8 opened talks here in Aomori a day after United States and Asia's four largest powers voiced "serious concerns" that the global economy was under threat.  Japan's energy minister Akira Amari, who said Saturday that rising oil prices were "a major risk factor" for the world economy, was to chair the meeting.  The G8 energy ministers, with Germany represented by an administrative secretary, were holding an one-hour meeting, followed by wider talks with countries including China, India and South Korea.