Australia may be left without a climate change policy following mining magnate Clive Palmer's decision to direct his United Party senators to block the Government's direct action plan.
The plan, which has been criticised by environmentalists and economists, is intended to replace the former Labor Administration's carbon tax and its stillborn greenhouse emissions trading scheme.
Prime Minister Tony Abbott's Coalition Government has been progressively dismantling Labor's climate change and other environmental policies and bodies since it won power last September.
Its latest target is the National Water Commission, which provides the Government with independent scientific advice on water policy, including the management of the ailing Murray Darling Basin.
Abbott's election pledge to abolish the carbon tax has been thwarted in the Senate, where Labor and the Greens have blocked repeal legislation.