- 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.
- Accordingly, fluctuations on periods shorter than a few decades, such as El Niño, do not represent climate change.
The term sometimes is used to refer specifically to climate change caused by human activity; for example, the United Nations Framework Convention on Climate Change defines climate change as "a change of climate which is attributed directly or indirectly to human activity that alters the composition of the global atmosphere and which is in addition to natural climate variability observed over comparable time periods.
3.In the latter sense climate change is synonymous with global warming
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