Reuters: The world should cut the level of carbon dioxide in the atmosphere to below that of 20 years ago, more deeply than most government plans, to avoid the worst of climate change, a group of 150 advocates said on Monday. "We’ve gone too far — in a dangerous direction," scientists, politicians, business leaders and others said in full-page advertisements in the Financial Times, the New York Times, the International Herald Tribune and two Swedish dailies. They said that …