According to the United Nations Framework Convention on Climate ChangeAccording to the United Nations Framework Convention on Climate Change, climate change is change in the climate of the whole Earth or a region of the Earth that is believed... More, climateThe average weather we would expect over a long period of time (seasons, years, decades). Climate varies from place-to-place across the Earth. Climate is determined by long-term (over at least... More change is change in the climate of the whole Earth or a region of the Earth that is believed to be caused, directly or indirectly, by human activity. Using this definition, change driven by natural processes is called climate variabilityChanges in climate that are driven solely by natural processes such as variation in the Earth's orbit, the sun's energy output, volcanic activity and meteorite impacts. See also Climate change.... More. However, the Intergovernmental Panel on Climate Change uses the term ‘climate change’ to mean any change in climate, regardless of the cause.

To understand climate change, it is important to know the difference between weather* and climate. Climates change naturally (sometimes called climate variability) and have changed many times over thousands of years. Human activities believed to result in climate change include burning of fossil fuels and deforestation. The term anthropogenic climate change is also used when referring to climate change caused by humans. See also global warmingThe enhanced greenhouse effect due to human activity and the resulting widely accepted rising average temperature near the surface of the Earth since the late 19th century (and its projected... More.

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