Prior to becoming Opposition Leader in November 2009, Abbott questioned the science of climate change and an ETS. In November 2009, Abbott outlined his objections to the Rudd Government's carbon pricing plan on the ABC's Lateline program. Upon becoming Leader of the Opposition, Abbott put the question of support for the Government's Carbon Pollution Reduction Scheme (CPRS) to a secret ballot and the Liberal Party voted to reject the policy – overturning an undertaking by Turnbull to support an amended version of the government's scheme. Under Abbott, the Coalition joined the Greens and voted against the CPRS in the Senate, and the bill was defeated twice, providing a double dissolution trigger. The Rudd government eventually deferred its CPRS legislation until 2013.