A new study shows that scientists have probably under-estimated the role that water vapour plays in determining global temperature changes.

The research, led by one of the world's top climate scientists, suggests that almost one-third of the global warming recorded during the 1990s was due to an increase in water vapour in the high atmosphere, not human emissions of greenhouse gases. A subsequent decline in water vapour after 2000 could explain a recent slowdown in global temperature rise.

To read the full report from the Guardian

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