Senator BRANDIS (Queensland—Deputy Leader of the Opposition in the Senate) (14:03): Mr President, I ask a supplementary question. Can the minister name a single senior official in either the United States administration or the Canadian government—just one—who believes there will be an economy-wide carbon tax in either of those two countries by 2016, as the government's own modelling assumes? Honourable senators interjecting— The PRESIDENT: When there is silence on both sides we will proceed.