Barack Obama's first foreign trip as president to Canada aims to address Canadian concerns about US protectionism. Trade, clean energy technology, the global economic crisis, and the war in Afghanistan will be discussed during the one-day trip to Ottawa, although time for substantive talks is limited. The main focus will be on trade, with Canadian Prime Minister Stephen Harper seeking reassurances that the "Buy American" clause in the US economic recovery package will not harm Canadian firms. Obama has stated that protectionist policies could have negative consequences, and he will work to alleviate Canadian fears. The "Buy American" provision requires that any public works project funded by the stimulus package must use goods made only in the United States, including iron and steel. While Obama has emphasized that the U.S. will adhere to its international trade obligations, Harper expressed concern about the wording of the clause. Canada is also worried about Obama's intention to renegotiate the North American Free Trade Agreement, as it may result in new tariff barriers. Obama aims to enhance environmental and labor regulations. U.S. and Canadian labor unions have urged for changes in various NAFTA provisions before Obama's meeting with Harper. The AFL-CIO labor federation and the Canadian Labour Congress have jointly stated that the worsening economic crisis needs to be addressed in a coordinated manner. They also emphasize the need to reopen and correct the flaws in the North American Free Trade Agreement, as well as implement a range of complementary policies related to energy, climate change, green jobs, industrial policy, migration, and development. Three-way trade between the United States, Mexico, and Canada has increased significantly since NAFTA came into effect in 1994, reaching nearly $1 trillion. Despite the benefits, NAFTA is often criticized for causing job losses in the US, particularly in manufacturing states. US officials have indicated that while President Obama will discuss these issues with Canadian Prime Minister Harper, the current fragile state of the global economy means that there will not be a strong push for a NAFTA review at this time. Obama's commitment to promoting trade between the neighboring countries, which amounts to $1.5 billion a day, will be emphasized during the talks. Obama will discuss clean energy technology with Harper, emphasizing Canada's importance as a key US energy supplier. Environmentalists are urging Obama to push Canada to clean up its environmentally damaging tar sands in Alberta. Obama expressed interest in working with Canada on new technologies to capture greenhouse gases, acknowledging the US's reliance on Canada as its main energy supplier. He also plans to address Canada's role in Afghanistan, where it has troops as part of a NATO-led mission to combat insurgency. However, as Canada is set to remove its troops in 2011 and Obama has stated that he will not be requesting for them to stay longer, the discussions are likely to center on alternative ways for Canada to provide assistance. US authorities have described Thursday's meeting, occurring soon after Obama became president, as a chance for Obama to strengthen his personal bond with Harper, a conservative leader who had a close relationship with former President George W. Bush.