Having collected the Nobel peace prize in 2007, Al Gore’s fortunes as a climate crusader slid into the doldrums. But 8th November 2011 arrived as a ray of sunshine. On that day Australia’s parliament passed into law the world’s first economy-wide carbon tax. Rushing to his blog, Gore posted a short but rapturous statement, cross-posted in The Huffington Post. His fervent language echoed in progressive circles across the globe. Australians have been held-up as pioneering environmentalists ever since, putting Americans to shame.