Reuters: Agriculture poses a key challenge to the Asia-Pacific Economic Cooperation’s vision of free trade in the region, Australian Trade Minister Craig Emerson said on Wednesday. “The opening up of agricultural sectors of APEC economies remains a key challenge,” Emerson said in a statement. “Some APEC economies maintain very high levels of protection in agriculture.” The 21 APEC economies are meeting this week in Japan’s port city of Yokohama. One of the key items on their agenda is finding a pathway…