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Cosmic Rays, Solar Forcing and 20th century climate change

Nir J. Shaviv, IAS Princeton and Hebrew University of Jerusalem
Monday, March 9, 2015 - 4:00pm to 5:00pm
PAA A-102

The 20th Century has
seen a notable temperature rise, generally attributed to the greenhouse effect
of anthropogenic gases, and a future "business as usual" policy is generally
believed to be catastrophic. However, significant evidence indicates that the
sun plays a major role in climate change. We will review the evidence which
proves the existence and quantifies the physical mechanism linking between
solar activity and climate—galactic cosmic ray ionization of the atmosphere and
its effect on cloud cover. We will see that once the link is taken into
account, a much more consistent picture for the 20th century global warming is
obtained. In it, climate sensitivity is low and future climate change is
benign.

​Invited by the UW Physics graduate students

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