All three major global surface temperature reconstructions show that Earth has warmed since1880.Most of this warming has occurred since the 1970s, with the 20 warmest years havingoccurred since 1981 and with all 10 of the warmest years occurring in the past 12 years.Eventhough the 2000s witnessed a solar output decline resulting in an unusually deep solarminimum in 2007-2009, surface temperatures continue to increase.The number of record high temperature events in the United States has been increasing, whilethe number of record low temperature events has been decreasing, since 1950. The U.S. hasalso witnessed increasing numbers of intense rainfall events.
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