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In page Clean Energy Act 2011:

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Choosing not to negotiate with the Australian Greens, who did not hold the balance of power in the Senate,[4] the government entered negotiations with the new leader of the Liberal party, Malcolm Turnbull, and in the lead up to the Copenhagen Conference, developed an amended Carbon Pollution Reduction Scheme (CPRS), with Turnbull's support. Following a party revolt by Coalition members opposed to the Scheme, and shortly before the carbon vote, Tony Abbott challenged for the leadership of the Liberal Party and narrowly defeated Turnbull. Thereafter the Coalition opposed the ETS outright and the government was unable to secure the support of any other senators for its CPRS.[citation needed]