As the world’s governments meet in Lima this week to discuss what to do about climate change, many are already looking ahead to the next round of climate talks in Paris. Those same governments have agreed to strike a new deal to shape the global response to climate change in a year’s time. And there’s good reason to be optimistic that an agreement could be reached in 2015.

What happens in Paris will be critical, since the world’s response to climate change so far has been inadequate and the eco