WASHINGTON - President Bush, stepping into the debate over global warming, plans to announce on Wednesday a national goal for stopping the growth of greenhouse gas emissions over the next few decades. In a speech in the Rose Garden, Bush will lay out a strategy rather than a specific proposal for curbing emissions, White House press secretary Dana Perino said Tuesday. She did not disclose details of his announcement and would not say whether the president would propose any kind of mandatory cap on greenhouse gas emissions. The president wants every major economy, including fast-growing nations like China and India,...