As of 2013, 9 of the 10 warmest years on record were during the 21st century. Only one 20th century year, 1998 was among the 10 warmest.
The average surface temperature of the Earth has risen by around 1.0° F over the past century. All eleven of this century's warmest years have happened since 1980, with 1998 being the warmest year ever recorded. Compared to the equatorial regions, higher latitudes have warmed more.
Since the late 1800s, the average surface temperature of the Earth has risen by around 1.8°F (1.0°C).
After 1880, the ten warmest years have all occurred since 1998, and all but one have done so since 2005.
The Earth's surface absorbs sunlight from the sun as it travels through the atmosphere, warming it. The atmosphere then receives this energy again. The atmosphere's greenhouse gases, such as carbon dioxide and methane, operate as a blanket to collect this energy and keep it from escaping into space. Without the greenhouse effect, the average temperature at the Earth's surface would be 0 degrees Fahrenheit, which is about 60 degrees Fahrenheit lower than the present average. As a result, the greenhouse effect is crucial to the continuation of life on Earth. But when greenhouse gas concentrations rise due to human activity, the earth is becoming warmer and this has an influence on ecosystems and our way of life.
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