From: Mike N. 

http://news.bbc.co.uk/2/hi/science/nature/3869753.stm

"A new analysis shows that the Sun is more active now than it has been
at anytime in the previous 1,000 years.

Scientists based at the Institute for Astronomy in Zurich used ice cores
from Greenland to construct a picture of our star's activity in the past.

They say that over the last century the number of sunspots rose at the same
time that the Earth's climate became steadily warmer. " ...
" This latest analysis shows that the Sun has had a considerable
indirect influence on the global climate in the past, causing the Earth to
warm or chill, and that mankind is amplifying the Sun's latest attempt to
warm the Earth."

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