National Public Radio: One of the consequences of the worldwide recession is that factories are producing less — and thus emitting less climate-warming carbon dioxide (CO2). That’s good for the climate, but not so good for the once-booming carbon market. Under a system laid down by the 1997 Kyoto Protocol, European and Japanese companies are given a limited number of permits to emit CO2. The United States opted not to participate in the Kyoto system. If a company emits less than planned, it can sell …