Paper shows solar activity at end of 20th century was near highest levels of past 11,500 years — Published in Astronomy & Astrophysics

Multiple peer-reviewed publications have shown that small changes in solar activity can have greatly amplified effects upon climate via a variety of mechanisms, including:

1. Galactic cosmic rays/clouds

2. Ocean oscillations, which have been shown in multiple studies to be driven by solar activity

3. Global brightening following the ice age scare of the 1970′s, due to decreased aerosols/clouds noted in multiple studies around the globe

4. Effects on ozone production from large changes in solar UV within and between solar cycles, which has large secondary effects on surface temperature

5. Forcing due to changes in length of day