Climate change was dubbed as "the greatest challenge we face." in a debate yesterday between Environment Minister Malcolm Turnbull and his Labor Shadow Peter Garrett.

Mr Turnbull nominated water policy as the defining point of difference between the ruling Coalition and Labor, saying the Coalition had "the experience to deliver."

Both parties have promised financial incentives to further develop clean coal technology and solar energy initiatives. The coalition has set a renewable energy target of 15 per cent by 2020, while Labor wants 20 per cent of energy to come from clean sources. Both parties have failed to set short-term carbon emission targets though Labor has promised a 60% cut by 2050.

Mr Turnbull recently announced a $10b climate change adaptation fund and Mr Garrett referred to Labor’s announcements of rebates for solar panels and rainwater tanks.

A major point of difference is the Kyoto Protocol. Mr Garrett said that Labor would immediately sign the Protocol "so we can take our seat at the negotiating table." Mr Turnbull said a post-Kyoto international framework must include major emitters like China and India. In concluding, Mr Garrett said the election calls for "decisive committed leadership on climate change." Mr Turnbull emphasized the importance of securing and protecting water supplies, saying that "water also needs leadership." More details of policies on the ALGA election website.