April 17, 2012. The European Union should consider expanding its emissions trading system to cover the region's transport industry and shouldn't judge the effectiveness of the program by a decline in carbon-permit prices, Poland said. The 27-nation bloc needs to modify its cap-and-trade program, the world's largest, to make it "a landmark product" for countries taking part in global climate talks. The document, sent to other EU member states before an informal meeting of environment ministers in Denmark, is Poland's contribution to a debate about the ETS scheduled for April 19. The talks will take place two weeks after carbon prices fell to a record low on oversupply of allowances amid a recession. The ETS is the cornerstone of EU climate policy and imposes emission curbs on more than 12,000 carbon-discharging facilities owned by power producers and manufacturers. This year the system expanded beyond the bloc's borders for the first time since its creation in 2005, covering flights from and to European airports and triggering opposition from countries outside the region, including the U.S., Russia, China and India.