![]() ![]() ![]() Since the pre-industrial period, human activities are estimated to have increased Earth’s global average temperature by about 1 degree Celsius (1.8 degrees Fahrenheit), a number that is currently increasing by more than 0.2 degrees Celsius (0.36 degrees Fahrenheit) per decade. This term is not interchangeable with the term "climate change." ![]() Global warming is the long-term heating of Earth’s surface observed since the pre-industrial period (between 18) due to human activities, primarily fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth’s atmosphere. Learn more about global surface temperature here. This graph illustrates the change in global surface temperature relative to 1951-1980 average temperatures, with the year 2020 tying with 2016 for hottest on record (Source: NASA's Goddard Institute for Space Studies). ![]()
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