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I.
Climate change is a significant and lasting change in thestatistical distribution of weather patterns over periods rangingfrom decades to millions of years. It may be a change in averageweather conditions, or in the distribution of weather around theaverage conditions (i.e., more or fewer extreme weather events).Climate change is caused by factors that include oceanic processes(such as oceanic circulation ), biotic processes, variations in solar radiation received by Earth, plate tectonics and volcanic eruptions ,and human-induced alterations of the natural world; these lattereffects are currently causing global warming , and "climate change"is often used to describe human-specific impacts.