LIMINAL

After another frigid and dry Canberra winter, I've welcomed the warmer weather with joy. Yet it's increasingly too warm to leave a lasting smile. We are told to brace for punishing summers. In a new book, Plutocene: Blueprints for a Post-Anthropocene Greenhouse Earth , the Australian National University's Dr Andrew Glikson says there's no turning back the greenhouse clock. He foresees mass extinctions and a breakdown of civilisation. In his book, Defiant Earth , Clive Hamilton of the Canberra-based Centre for Applied Philosophy and Public Ethics foresees something even worse: the possibility of our own extinction by an untameable Earth. Hamilton writes it will probably be hundreds of thousands of years before most of the large reserves of carbon released during the human age can be rendered immobile again. People have rivaled the great forces of nature so much so that we have changed the functions of the planet for an era. The Arctic is vanishing as is the Greenl