The outcome could be very significant for the climate, says one of the country's top scientists.
Australia's 2030 emissions reduction target of 26% on 2005 levels - half the US and UK benchmarks - has been called "a great disappointment".
And Mr Morrison's plan to bring it down has been criticised for hanging on technologies that do not exist yet. Labor has stressed its policy will not leave "emissions intensive" industries - like mining - at a disadvantage to their global competitors. Like the coalition, Labor is hoping the market will phase out coal without intervention, which Prof Howden says is risky.
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