Senator WILLIAMS (New South Wales—Nationals Whip in the Senate) (14:37): Mr President, I ask a supplementary question. Can the minister advise how many Australian trucks are now fitted with the Euro 4 engines, which are designed to give cleaner emissions? Given that these Euro 4 engines also increase fuel consumption by around 10 per cent, meaning more costs for the operators, does the minister now concede that the trucking industry is already being taxed in the pursuit of cleaner emissions before it is lumbered with a carbon tax on 1 July 2014?