In order to fully understand what climate change means, we need to define climate. NASA put it in very easy terms:
“Climate is the usual weather of a place. Climate can be different for different seasons.”
CSIRO in cooperation with the Australian Department of Environment has an own research site on climate change and defines climate (change) as :
“[t]he average weather experienced at a site or region over a period of many years, ranging from months to many thousands of years. The relevant measured quantities are most often surface variables such as temperature, rainfall and wind.”
A change in the state of the climate that can be identified (e.g. by statistical tests) by changes in the mean and/or variability of its properties, and that persists for an extended period of time, typically decades or longer.
Follow this link to WWF to learn more about the reciprocative relationship between forests and climate (change).