Canada's Prime Minister Justin Trudeau will appear at President Biden's climate summit on Thursday with a colossal reputation as a climate change champion.

Mr. Biden has already declared climate change a priority for his government. He is likely to announce at the summit that the US will reduce greenhouse gas emissions by about half by 2030, relative to 2005 levels.

Mr. Trudeau is set to propose a new reduction goal for the same time frame, but few analysts believe he can equal Mr. Biden's reduction.

According to Dale Beugin, vice president of science and analysis at the Canadian Institute for Climate Choices, a nonpartisan research organization, the timing could put Canada in a bind.

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