The United States expects Asia Pacific leaders on Sunday to take a "significant step" toward reducing tariffs and other barriers that block trade in environmentally-friendly good and services, a senior administration official said on Sunday.

"We're in a good place. We has some very constructive discussions around the important issue of environmental goods and services trade liberalization," the U.S. official told Reuters at the annual summit meeting of the 21 members of the Asia Pacific Economic Cooperation.