Before revision:  This design appears to be closer to "first best" , with a lower cost of climate mitigation , than any in the literature, while increasing the certainty of avoiding catastrophic global warming. It might also provide a faster pathway to implementation  .
After revision:  This design appears to be closer to "first best" , with a lower cost of climate mitigation , than any in the literature, while increasing the certainty of avoiding catastrophic warming. This design should also have a faster pathway to implementation .