claim: "The IPCC’s Fourth Assessment Report, 2007, carries in three places a graph in which the Hadley Center’s global mean surface temperature anomaly dataset from 1850-2005 is displayed with four arbitrarily-chosen trend-lines overlaid upon it.
evidence: 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.