More excerpts from the report for the scientifically challenged:
Long-term temperature observations are among the most consistent and widespread evidence of a warming planet. Global annually averaged temperature measured over both land and oceans has increased by about 1.8°F (1.0°C) according to a linear trend from 1901 to 2016, and by 1.2°F (0.65°C) for the period 1986–2015 as compared to 1901–1960. The last few years have also seen record-breaking, climate-related weather extremes. For example, since the Third National Climate Assessment was published,
1 2014 became the warmest year on record globally; 2015 surpassed 2014 by a wide margin; and 2016 surpassed 2015.
2 ,
3 Sixteen of the last 17 years have been the warmest ever recorded by human observations.
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While thousands of studies conducted by researchers around the world have documented increases in temperature at Earth’s surface, as well as in the atmosphere and oceans, many other aspects of global climate are also changing
12 ,
13 (see also EPA 2016, Wuebbles et al. 2017
10 ,
14 ). Studies have documented melting glaciers and ice sheets, shrinking snow cover and sea ice, rising sea levels, more frequent high temperature extremes and heavy precipitation events, and a host of other climate variables or “indicators” consistent with a warmer world (see Box 2.2). Observed trends have been confirmed by multiple independent research groups around the world.
Fourth National Climate Assessment: Chapter 2: Our Changing Climate