The World Meteorological Organization says the first half of 2008 was the coolest in at least five years. It expects 2008 will almost certainly be cooler than recent years, although temperatures remain above the historical average. The United Kingdom Meteorological Office's Hadley Centre for Climate Change says data shows worldwide temperatures have declined since 1998.

A scientist with the WMO says, "We can expect with high probability this year will be cooler than the previous five years."

Climate scientists differ about whether the cooling temperatures undermine the case for man-made global warming.

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