Climate change

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Climate change is a long-term change in the statistical distribution of weather patterns over periods of time that range from decades to millions of years. It may be a change in the average weather conditions or a change in the distribution of weather events with respect to an average, for example, greater or fewer extreme weather events. Climate change may be limited to a specific region, or may occur across the whole Earth.

In recent usage, especially in the context of environmental policy, climate change usually refers to changes in modern climate. It may be qualified as anthropogenic climate change, more generally known as global warming or anthropogenic global warming (AGW).



The most general definition of climate change is a change in the statistical properties of the climate system when considered over periods of decades or longer, regardless of cause.[1][2] Accordingly, fluctuations on periods shorter than a few decades, such as El Niño, do not represent climate change.

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