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==Description==
==Description==
'''Climate change''' is a [[change]] in the [[statistical]] distribution of [[weather]] patterns when that change lasts for an extended period of [[time]] (i.e., decades to millions of years). ''Climate change'' may refer to a change in [[average]] [[weather]] conditions, or in the time variation of weather around longer-term average conditions (i.e., more or fewer [[extreme]] weather events). ''Climate change'' is caused by factors such as biotic processes, variations in solar [[radiation]] received by [[Earth]], plate tectonics, and volcanic eruptions. Certain [[human]] activities have also been identified as significant [[causes]] of recent ''climate change'', often referred to as "[http://en.wikipedia.org/wiki/Global_warming global warming]".
'''Climate change''' is a [[change]] in the [[statistical]] distribution of [[weather]] patterns when that change lasts for an extended period of [[time]] (i.e., decades to millions of years). ''Climate change'' may refer to a change in [[average]] [[weather]] conditions, or in the time variation of weather around longer-term average conditions (i.e., more or fewer [[extreme]] weather events). ''Climate change'' is caused by factors such as biotic processes, variations in solar [[radiation]] received by [[Earth]], plate tectonics, and volcanic eruptions. Certain [[human]] activities have also been identified as significant [[causes]] of recent ''climate change'', often referred to as "[http://en.wikipedia.org/wiki/Global_warming global warming]".
<center>For lessons on the topic of '''''Climate Change''''', follow [http://nordan.daynal.org/wiki/index.php?title=Category:Climate_Change '''''this link'''''].</center>
[[Scientists]] actively work to [[understand]] [[past]] and [[future]] climate by using [[observations]] and theoretical [[models]]. A climate record — extending deep into the Earth's [[past]] — has been assembled, and continues to be built up, based on [[geological]] [[evidence]] from borehole temperature profiles, [http://en.wikipedia.org/wiki/Ice_core cores removed from deep accumulations of ice], floral and faunal records, [[glacial]] and periglacial [[processes]], stable-isotope and other analyses of sediment layers, and records of past [[sea]] levels. More recent data are provided by the instrumental record. General circulation models, based on the [[physical sciences]], are often used in [[theoretical]] approaches to match past climate data, make future [[projections]], and link [[causes]] and [[effects]] in climate change.[[http://en.wikipedia.org/wiki/Climate_change]
==See also==
==See also==
*'''''[[Climate]]'''''
*'''''[[Climate]]'''''
*'''''[[Catastrophism]]'''''
*'''''[[Catastrophism]]'''''
