Bloomberg: When the United States and China agreed to a joint climate change initiative four weeks ago, it left the leaders of two of their major trading partners in an awkward position.
For Australia, its strong growth of recent years has depended on China's voracious appetite for coal and other resources. For Canada, the US is its largest energy market, and it has sought to keep its climate policies in close alignment.
Neither Australia's Prime Minister Tony Abbott nor Canada's Stephen Harper have ever...