In the U.S., coal production has slowed in part because of environmental concerns. Proposals for new coal-burning electric plants have run into regulatory roadblocks. Others have been shelved because of fears of new cap-and-trade rules. But in China and India, such concerns haven't slowed the headlong rush to coal to fuel industry and generate electricity. That's one big reason Bucyrus International (BUCY), a south Milwaukee-based maker of mining