Bloomberg: Green bonds may help provide the $1 trillion annual investments in clean energy that environmental groups say is necessary to limit the impact of climate change. Its catching on like wildfire, Michael Eckhart, a managing director at Citigroup Inc. and founder of the American Council on Renewable Energy, said today in an interview. Weve reached the Holy Grail, which is the bond market. More than $16.6 billion has already been sold worldwide this year, surpassing last years $14 billion, as...