Australian: CLIMATE change is a global problem requiring a global solution. And, as Ross Garnaut has observed, the roadblock to a global solution is the prisoners’ dilemma or free rider problem: if we all wait for others to act first, nothing gets done. But there is a flaw in the architecture the Government is proposing to cut carbon emissions. If the free rider problem is the obstacle to a global policy, then the first design criterion is not to make the problem worse than it has to …