The Carbon Counter

National debt used to be the big number we all lived in fear of. Now it's greenhouse gases.

Climate change is likely to have all sorts of nasty consequences over the next century—among them, according to a brand-new report from the U.S. Global Change Research program, an increase in torrential downpours in the American northeast.

So it was uncomfortably fitting that a major climate-consciousness-raising event took place in just such a downpour. As reporters and dignitaries huddled under leaky tents just outside New York's Madison Square Garden on Thursday, Deutche Bank switched on its mammoth Carbon Counter billboard. The counter, towering 70 feet above busy Seventh Avenue and dramatically visible to hundreds of thousands of commuters who take the train to and from Penn Station, displays a real-time count of heat-trapping greenhouse gases we're pumping into the atmosphere—about 2 billion metric tons every month, added to the 3.6 trillion tons already floating around up there.