Reuters: New European targets for cutting emissions of greenhouse gases are a strong signal to other countries to reduce their carbon output, the U.N. environment chief said on Friday. The European Commission’s plan to cut emissions unilaterally by 20 percent by 2020, announced this week, is "quite far-reaching," Achim Steiner, head of the United Nations Environment Programme, said at the annual meeting of the World Economic Forum. "I think the signal value of the European …