The Arctic tree line is sensitive to climatic change and is expected to be one of the first major vegetation boundaries to register greenhouse warming if it is indeed occurring.
Rocky Mountain Climate
The ozone hole that forms over Antarctica each spring is believed caused by a cascade of chemical reactions that begin on the cloud particles at temperatures of minus 118 F.
Is this pattern of change a manifestation of the global warming and related climate change associated with increases in greenhouse gases in the atmosphere? Or is this pattern a natural decadal-timescale variation?