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The Discovery of Global Warming                      February 2015

Global mean sea level from tide gauges, as calculated by different research groups with various methods; the black line is from highly accurate satellite measurements. Sea levels have generally risen since the end of the last Ice Age, more in some places than others. But there has been a notable acceleration of the rise starting in the 1980s. That is just what greenhouse effect models predicted would happen because of expansion of sea water under the influence of global warming. A further acceleration of the rise is expected in future due to melting glaciers and ice sheets.

sea level graph

Graph by Klaus Bittermann, more information at realclimate.org. Source: Hay et al. (2015).