So what Mr Roodhouse and his ilk should call for is a global system of individual tradeable permits, to operate not just for a decade, but for the indefinite future.

• 因此，鲁德豪斯等人应当呼吁的是，在全球范围内建立一个可交易的个人排放权制度，期限不是只有10年，而是无限的未来。