Turn the clock back four years, and you could not have slipped a cigarette paper between the climate policies of the administrations in Washington DC and Canberra.
With the election of Kevin Rudd in December 2007, paths diverged.
Against the backdrop of opinion polls showing climate change as a major concern for Australians, Mr Rudd's Labor government ratified the Kyoto Protocol, unveiled new targets for cutting carbon emissions and announced that a new emissions trading scheme (ETS) would be the principal vehicle for reaching those targets.
A year later, Barack Obama entered the Washington White House, talking a positive game on the issue but making clear his desire or even his need for legislation to proceed through both Houses of Congress, and maintaining his opposition to re-entering the Kyoto fold.
Now, there's a case for arguing that the old days are back, and that Canberra and Washington are once again in step.
See the BBC News story
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