qObserved warming
q 0.6°C in the last 100 years.
qTectonic Scale
q Cooling by 0.00002°C within 100 years
qOrbital Scale
q Cooling by 0.02°C within 100 years
qMillennial Scale
q Uncertain, but probably on the order of 0.02°C (such as the net cooling into the Little Ice Age)
qSolar Activities
q May cause 0.2°C warming