Habibullo Abdussamatov, the head of space research at St. Petersburg's Pulkovo Astronomical Observatory in Russia, has published a paper in which he tracks sunspot activity going back to the 19th century to argue that total sun irradiance, or TSI, is the primary factor responsible for causing climate variations on Earth, not carbon dioxide."
Wow -- the sun is responsible for heating the Earth? Who'd have thunk it?