U.S. President Joe Biden held his first bilateral meeting with Canadian Prime Minister Justin Trudeau on Tuesday, where climate change and China took centre stage.Seeking to turn the page on former U.S. President Donald Trump's unorthodox foreign policy, Biden reiterated his commitment to the U.S.-Canada relationship, and pledged to work together on achieving net-zero emissions by 2050."We also doubled down on our efforts to tackle climate change. It was really, really encouraging. Now that the United States is back in the Paris (climate) agreement, we intend to demonstrate our leadership in order to spur other countries to raise their own ambitions. Canada and the United States are going to work in lockstep to display the seriousness of our commitment at both home and abroad."Trudeau also thanked Biden for the U.S.'s support calling for the release of two Canadians detained by China, Michael Spavor and Michael Kovrig.They were arrested by Beijing in 2018 on espionage charges after Canada's detention ofHuawei's chief financial officer on a U.S. arrest warrant.The bilateral meeting comes shortly after Biden irritated Canada by blocking the multimillion dollar Keystone XL oil pipeline project and proposing a "Buy American" program aimed at directing U.S. spending toward domestic manufacturers, but both leaders made clear they wanted to put the dispute behind them and strengthen their alliance.