In an effort to predict future climate change, researchers are using three methods to help clarify climate-change predictions. Tree ring dating (dendrochronological) studies of forest trees from temperate and boreal (cold) regions such as Tasmania; ice core measurements from Antarctica and measurement of greenhouse and ozone-depleting gases through GASLAB (Global Atmospheric Sampling Laboratory), based at CSIRO Division of Atmospheric Research. GASLAB takes clean air samples from around the world and analyses them for carbon dioxide, methane, carbon monoxide, nitrous oxide and chlorofluorocarbons.