Scientific evidence concludes that global warming and climate change are happening now. There is overwhelming scientific agreement on human-caused global warming. More than 97 percent of publishing scientists and a synthesis of peer reviewed studies confirm this scientific fact. Virtually all national and international science academies and societies have issued statements or assessments affirming humans' role in recent climate change. This includes the academies of science from 80 countries. No scientific body in the U.S. or internationally formally dissents from this consensus.
Global warming refers to the upward temperature trend across the entire Earth since the early 20th century, and most notably since the late 1970's, due to the increase in fossil fuel emissions since the industrial revolution. Worldwide since 1880, the average surface temperature has gone up by about 0.8 degrees C (1.4 degrees F), relative to the mid-20th century baseline (of 1951-1980).
Climate change refers to a broad range of global phenomena created predominantly by burning fossil fuels, which add heat-trapping gases to Earth's atmosphere. These phenomena include the increased temperature trends described by global warming, but also encompass changes such as sea level rise; ice mass loss in Greenland, Antarctica, the Arctic and mountain glaciers worldwide; shifts in flower/plant blooming; and extreme weather events.
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