Bloomberg: European Union carbon permits fell the most in a week as data showed emitters exchanged fewer United Nations offsets than estimated for the EU contracts, signaling lower future demand. Emitters swapped 133 million metric tons of Certified Emission Reductions and Emission Reduction Units through the end of April under a system begun about March 18, the European Commission said today in a statement on its website. That was less than half of the 300 million tons projected by Bloomberg New Energy Finance....