'No Sun link' to climate change

By Richard Black

April 3, BBC News

Scientists have produced further compelling evidence showing that modern-day climate change is not caused by changes in the Sun's activity.

The research contradicts a favoured theory of climate "sceptics", that changes in cosmic rays coming to Earth determine cloudiness and temperature.

The idea is that variations in solar activity affect cosmic ray intensity.

But Lancaster University scientists found there has been no significant link between them in the last 20 years.

Presenting their findings in the Institute of Physics journal, Environmental Research Letters, the UK team explain that they used three different ways to search for a correlation, and found virtually none.

This is the latest piece of evidence which at the very least puts the cosmic ray theory, developed by Danish scientist Henrik Svensmark at the Danish National Space Center (DNSC), under very heavy pressure.

Dr Svensmark's idea formed a centrepiece of the controversial documentary The Great Global Warming Swindle.

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photo: Cloud cover affects temperature - but what determines cloud cover? (AFP)