New York Times: The European Union has long been a world leader on climate change, and its new agreement to cut greenhouse gas emissions 40 percent from 1990 levels by 2030 keeps it at the forefront of that effort. But experts question whether the plans European leaders have sketched out are strong enough to meet their ambitious goal, and even whether a 40 percent cut is enough to keep the Continent on track toward its longer-term target, an emissions cut of between 80 percent and 95 percent by mid-century. Even...