PARIS (AFP) – A cold front is sweeping across Europe after gripping swathes of North America last month, but the deep freeze does not mean the threat of global warming has abated, caution scientists. "The major trend is unmistakably one of warming," Michel Jarraud, secretary general of the World Meteorological Organisation (WMO), told AFP. "If we look at the trajectory over the last 160 years, it overlays a large natural variability, and that's what causes confusion." The cooler weather that was a hallmark of 2008 can be explained partly by La Nina, a reversal of the phenomenon by which warm...
