Associated Press: President Bush on Wednesday hailed the move by G-8 leaders to coalesce behind a broad climate-change strategy, saying in a valedictory to summitry that ‘significant progress’ has been made on global warming. ‘In order to address climate change, all major economies must be at the table, and that’s what took place today,’ Bush said. Environmentalists said the summit’s broad pledge to work toward slashing greenhouse gas emissions by 50% by 2050 did not go far enough. In fact, five …