They can buy in bulk...credits up for sale in corrupt 3rd world nations. Feed the dictators while they pay off the army and mercenaries. This scheme is rife with corruption already. Australia got out after realizing it was a massive costly bureaucracy where the money was difficult to trace to its end route.Those crooks Enron tried to implement this crap, seeing it was a cash cow, lucky they went belly up.In Australia,. It did nothing to alleviate global warming and cost thousands of jobs.