Natural Climate Changes
				q Observed warming       0.6°C in the last 100 years. q Tectonic Scale       Cooling by 0.00002°C within 100 years q Orbital Scale       Cooling by 0.02°C within 100 years q Millennial Scale       Uncertain, but probably on the order of 0.02°C (such as the net cooling into the Little Ice Age) q Solar Activities       May cause 0.2°C warming