Senator LUDWIG (Queensland—Minister for Agriculture, Fisheries and Forestry and Minister Assisting on Queensland Floods Recovery) (14:55): I thank Senator Birmingham for his first supplementary question. Honourable senators interjecting— The PRESIDENT: Order! Interjections are disorderly. Senator Ludwig is entitled to be heard in silence. Senator LUDWIG: If you look at what the US have committed to, you can see that Senator Birmingham does not do justice to it in his question. If you look at the comparability of Australia's efforts on a range of indicators, Australia's 2020 targets are comparable to those of other advanced economies, including the US. They have a 2020 target of 17 per cent below 2005 and a percentage change from 1990 of minus 2, a percentage change in per capita emissions of minus 29 and a cut in per capita emissions in 2020, implied by targets, of 17. That is what the US is seeking to achieve. But again it is global action that is being undertaken— Senator Birmingham: Mr President, I raise a point of order. Perhaps Senator Ludwig would care to explain to the chamber how it is they are achieving these targets without a carbon tax. The PRESIDENT: That is not a point of order. Senator Ludwig. Senator LUDWIG: It does seem that those opposite have lost the plot trying to explain why the world has not ended from 1 July when we introduced a price on carbon. (Time expired)