Austria, Germany, Italy and the Netherlands announced plans this week to prepare to resurrect old coal plants as gas supplies dwindled. The moves came just days after Moscow reduced natural gas flows to several European countries, including Italy and Slovakia, alarming leaders who are worried about energy reserves ahead of winter. That’s not the direction in which these government wanted to move. A return to coal would controvert climate policy already in place in Amsterdam and Berlin. Some officials are concerned about the longer-term threat such a move would post to efforts to fight climate change in Europe. “We have...