Monitor: Fear is not a good adviser, says German leader Angela Merkel. She offered that advice recently about a fear in Europe of Muslim migrants. But she might as well have been talking about global warming. Take the climate-change accord reached Dec. 12 by every nation on Earth. It certainly was driven by heightened concerns about potential threats from a rise in global temperatures. But after 23 years of trying to achieve a pact for universal action, negotiators finally found a way to an agreement beyond...