The White House framed the announcement from the world’s two largest polluters as a move to position the countries as leaders in the fight against climate chance ahead of a landmark U.N. conference to address the issue this fall. New regulations on building efficiency and standardized rules for heavy emitting vehicles will be among the key measures announced Friday during a state visit hosted by President Barack Obama for his Chinese counterpart Xi Jinping.

China had previously announced precursors of a cap-and-trade program and said it planned to roll out a system next year. Under such a system the national government sets a limit on carbon emissions and requires companies to purchase permits for their emissions. The system is planned to begin in China in 2017, a White House official said Thursday.

“This year is about showing the world our countries’ conviction to policies to reach those targets and to lead the world toward a durable global climate agreement,” said a senior administration official before the formal announcement.

Available at: http://time.com/4049192/us-china-climate-change/