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Climate change is the variation in the Earth, global climate or regional climates in time. These changes in the variability or medium state of the atmosphere over durations ranging from decades to millions of years. These changes may be caused by a dynamic process of the Earth, including external forces variations in the intensity of sunlight, and more recently by human activities.
In recent use, especially in the context of environmental policy, the term "climate change" often refers to changes in the modern climate (see global warming). For information on temperature measurements in various periods, and the available data sources, see temperature record. For the attribution of climate change during the last century, see the recent attributing climate change.
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