Where they've been tried, the evidence shows, well-designed carbon taxes have succeeded in reducing greenhouse-gas emissions. But that doesn't necessarily end the debate over their effects—nor should it.
The 2014 World Cup is going to be bigger than ever -- it's shaping up to be the most watched, most lucrative and expensive tournament in soccer history -- it's also going to be one of the biggest energy-consuming, greenhouse gas-spewing World Cups in history.
The bloc is considering new policies to improve its market after permits slid last year to a five-year low of 2.46 euros ($3.33) a metric ton and as United Nations envoys seek to seal a global climate deal in 2015.
Legislation is expected to emerge in September providing a regulatory framework for a U.S. cap-and-trade scheme that promises to be the world’s largest. Trading opportunities, however, already exist in the U.S. and abroad.