We normally have about 20% of Australia being forests, so 1/5 is still a fairly large number for a country classed as arid.
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"Natural climate forces can not be underestimated, but no climate model produced can show the speed of the melting in the Arctic that has occurred without adding human contributed emissions." A Physicist from the U.S Army.
http://www.theage.com.au/frontpage/2.../frontpage.pdf
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