It's been a tough year for those of us in the climate change community. Each week has seemed to bring either a fresh report reminding us of how precious little time we have left to try to turn this ship around or a disaster that has climate change's fingerprints all over it. Friends, family, colleagues and reporters have all asked whether I'm optimistic or hopeful about our ability to limit the severity of future climate change. And I'll be honest: I'm not. But that doesn't mean we should give up—in fact that would be among the worst things we could do. Rather, we need to hold fiercely to a vision of the future we want to see and work like hell to make it a reality.