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Global Average Temperature compared with the Atlantic Multi-decadal Oscillation (AMO) Index through 2009. The AMO Index is the average sea-surface temperature over the North Atlantic Ocean. The roughly parallel curves of the two parameters show that they are related: the increase in global temperature over time, coincident with the increase in greenhouse gases observed since the Industrial Revolution, is alternately obscured and enhanced by the AMO. Credit: NOAA Climate.gov