Canada and the United States reignite the spark. Climate change has brought them back together

Justin Trudeau and Barack Obama

Canadian Prime Minister Justin Trudeau and American President Barack Obama met and achieved a common path in tackling global warming © Chip Somodevilla/Getty Images

Justin Trudeau and Barack Obama

Canadian Prime Minister Justin Trudeau and American President Barack Obama met and achieved a common path in tackling global warming © Chip Somodevilla/Getty Images

Justin Trudeau and Barack Obama

Canadian Prime Minister Justin Trudeau and American President Barack Obama met and achieved a common path in tackling global warming © Chip Somodevilla/Getty Images

Justin Trudeau and Barack Obama

Canadian Prime Minister Justin Trudeau and American President Barack Obama met and achieved a common path in tackling global warming © Chip Somodevilla/Getty Images

Justin Trudeau and Barack Obama

Canadian Prime Minister Justin Trudeau and American President Barack Obama met and achieved a common path in tackling global warming © Chip Somodevilla/Getty Images

Justin Trudeau and Barack Obama

Canadian Prime Minister Justin Trudeau and American President Barack Obama met and achieved a common path in tackling global warming © Chip Somodevilla/Getty Images

Justin Trudeau and Barack Obama

Canadian Prime Minister Justin Trudeau and American President Barack Obama met and achieved a common path in tackling global warming © Chip Somodevilla/Getty Images

Justin Trudeau and Barack Obama

Canadian Prime Minister Justin Trudeau and American President Barack Obama met and achieved a common path in tackling global warming © Chip Somodevilla/Getty Images