Sydney Morning Herald: THE GREENS have emerged as the main threat to Environment Minister Malcolm Turnbull’s future, with polling tracking the party’s primary vote in his seat of Wentworth at a massive 20 per cent. And in the adjoining seat of Kingsford Smith, Labor’s environment spokesman Peter Garrett will be challenged by high-profile athlete Sue Mahony, who will be announced today as the Greens candidate. The current voting intention in Wentworth - confirmed by Liberal and Labor sources - has the …