ESS11
Prof. Jin-Yi Yu
Global Warming: Natural or Man Made?
qObserved warming
0.6°C in the last 100 years.
qTectonic Scale
Cooling by 0.00002°C within 100 years
qOrbital Scale
Cooling by 0.02°C within 100 years
qMillennial Scale
Uncertain, but probably on the order of 0.02°C (such as the net cooling into the Little Ice Age)
qSolar Activities
May cause 0.2°C warming
(from Earth’s Climate: Past and Future)