The rise in temperatures in the past two decades is different from the rise since of the past 1500 years as "the average global temperature has raised about 1 degree since past two decades."
The Earth is Warming as the Earth's average surface temperature has increased by about 1.8°F (1.0°C) since the late 1500s.
A look into the data of temperature increases over the last two decades shows the rate of increase appears to be rising.
What is the average global temperature?
The average global temperature is an estimate of Earth's mean surface air temperature averaged over the entire planet. The global temperature average has increased by 0.82 degrees Celsius when compared to the 20th century average.
According to NOAA's 2020 Annual Climate Report the combined land and ocean temperature has increased at an average rate of 0.13 degrees Fahrenheit ( 0.08 degrees Celsius) per decade since 1880.
However, the average rate of increase since 1981 (0.18°C / 0.32°F) has been more than twice that rate. So the temperatures are rising at a rapid pace.
Hence, the answer was given and explained above.
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