Climate change refers to a statistically significant variation in either the mean state of the climate or in its variability, persisting for an extended period (typically decades or longer). Climate change may be due to natural internal processes or external forcings, or to persistent anthropogenic changes in the composition of the atmosphere or in land use.
United Nations Framework Convention on Climate Change says it is:
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.
What is the difference? The IPCC says Climate Change is any change. UNFCCC says it is change caused by people. What we're talking about at 320 ppm is UNFCCC's definition.
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