The Globe and Mail reports in its Tuesday edition that in the past year, it has become fashionable to call Canada an energy superpower. Guest columnist Joe Calnan writes that Ottawa seems to have embraced the view that Canada's strengths in energy can be used for leverage as we approach the first formal joint review of the United States-Mexico-Canada Agreement. Ottawa needs to tread carefully with energy diplomacy. Our infrastructure and dependence on the U.S. show we may not have as much leverage as we believe. Past instances of using energy for political gain have often had mixed results. Canada should be very careful not to put our globally competitive and economically critical energy sector at risk, especially if energy measures are used to protect relatively small and uncompetitive industries. Canada's international energy exports are overwhelmingly reliant on pipelines to the U.S. And bilateral energy trade with Washington is not one way. Our two countries are better described as mutually dependent. While Canada is the largest supplier of American energy imports, much of Eastern Canada's oil and natural gas is either sourced from American suppliers or uses infrastructure controlled by the United States.