IPCC refers to a change in the stat

IPCC refers to a change in the state of the climate that can be identified by changes in the mean and/or the variability of its properties, and that persists for an extended period.
It refers to any change in climate over time, whether due to natural variability or as a result of human activity. This usage differs from that in the United Nations Framework Convention on Climate Change (UNFCCC), where climate change refers to a change of climate that is attributed directly or indirectly to human activity that alters the composition of the global atmosphere and that is in addition to natural climate variability observed over comparable time periods.