Greenhouse gas credit-trading beckons investors

The United States might have turned its back on the Kyoto Protocol but U.S. investors have not, tapping the roughly $25 billion in carbon emissions trading that’s a direct result of the global environmental agreement.

And investors are gearing up for what they hope will be a huge market once the United States establishes its own national scheme to reduce greenhouse gases, said speakers at a carbon-emissions trading conference here Monday.