Telegraph: Climate experts are forecasting a drop in global temperatures this year. Michel Jarraud, secretary-general of the World Meteorological Organisation, said temperatures in 2008 are likely to be cooler because of the effects of the La Nina in the central and eastern Pacific. He said it was likely that the La Nina phenomenon would continue into the summer. If his forecast is right it would mean temperatures have not risen globally since 1998 when El Nino warmed the world. La …