Worldwide temperatures will drop this year due to the La Nina current in the Pacific, prompting some scientists to ask if global warming really exists.

China has suffered extreme blizzards and record low temperatures, while Australia has had torrential rain due to La Nina - one of the Pacific's two great natural currents.

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Weather experts say La Nina will last into the summer - meaning world temperatures will not have risen since 1998.

A minority of scientists have argued this might mean the Earth has proved more resilient to greenhouse gases than predicted.

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