Will the EPA restrict water vapor?

From Icecap:

Water vapour worse climate change villain than thought

By Shanta Barley, New Scientist

A rise in water vapour in the atmosphere fuelled 30 per cent of the global warming that took place during the 1990s. This discovery suggests that the potent greenhouse gas plays a bigger role in climate change that we previously imagined.

Susan Solomon and colleagues at the US National Oceanic and Atmospheric Administration combined satellite measurements and weather balloon data to track changes in the concentration of water vapour 16 kilometres up in the stratosphere, between the 1980s and today.

Water vapour levels in the stratosphere increased in the 1990s but dropped by 10 per cent in 2001. After feeding their measurements into a climate model, the team suggests that vapour was to blame for almost a third of the warming that happened in the 1990s.

The model also suggests that the decline in water vapour concentrations that occurred in 2001 slowed down the rate of global warming in the last decade by 25 per cent.

“This research does not change the consensus view that human emissions drive climate change,” says Fortunat Joos, a climate modeller at the University of Bern, Germany.

Journal reference: Science DOI: 10.1126/science.1182488

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