"Global temperatures this year will be lower than in 2007 due to the cooling effect of the La Nina current in the Pacific, UN meteorologists have said.
The World Meteorological Organisation's secretary-general, Michel Jarraud, told the BBC it was likely that La Nina would continue into the summer.
This would mean global temperatures have not risen since 1998, prompting some to question climate change theory.
But experts have also forecast a record high temperature within five years.
'Variability'
La Nina and El Nino are two great natural Pacific currents whose effects are so huge they resonate round the world.
El Nino warms the planet when it happens, La Nina cools it. This year, the Pacific is in the grip of a powerful La Nina.
It has contributed to torrential rains in Australia and to some of the coldest temperatures in memory in snow-bound parts of China.
LA NINA KEY FACTS
La Nina 2008 Forecast (Source: UK Met Office Hadley Centre)
La Nina translates from the Spanish as 'The Child Girl'
Refers to the extensive cooling of the central and eastern Pacific
Increased sea temperatures on the western side of the Pacific means the atmosphere has more energy and frequency of heavy rain and thunderstorms is increased
Typically lasts for up to 12 months and generally l"
BBC NEWS | Science/Nature :
global hype
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