U.N. Secretary General Ban Ki-moon, right, bows to the guests prior to delivering a speech marking the 100th anniversary of the U.N. Peace Palace in The Hague, Netherlands, Wednesday Aug. 28, 2013. (AP Photo/Peter Dejong)
Emissions pour from The Corus steel plant in the Netherlands. The European Union’s cap-and-trade emissions trading scheme, while more affordable than the carbon tax, has run into problems of its own, as the early “market” for polluting rights proved badly out of whack, sending designers back to the drawing board. (Associated Press)