Climate change refers to significant, long-term changes in the global climate.
The global climate is the connected system of the sun, earth and oceans, wind, rain and snow, forests, deserts and savannas, and everything people do, too. The climate of a place can be described as its rainfall, changing temperatures during the year and so on.
But the global climate is more than the “average” of the climates of specific places.
A description of the global climate includes how, for example, the rising temperature of the Pacific feeds typhoons which blow harder, drop more rain and cause more damage, but also shifts global ocean currents that melt Antarctica ice.
It is this systemic connectedness that makes global climate change so important and so complicated.