Senator JOYCE (Queensland—Leader of The Nationals in the Senate) (14:57): Mr President, I ask a further supplementary question. At the time the Rudd government version 1 delayed the CPRS, the Leader of the Greens, Senator Brown, said that the decision could hardly be more disappointing. Isn't the government's refusal—both version 1 and version 2—to consider the delay more to do with their reliance on the Greens to stay in power than their ever-shifting belief in a carbon tax and their ever-shifting belief in who their leader should be?