I’m reading a collection of essays, “What Are You Optimistic About?: Today’s Leading Thinkers on Why Things Are Good and Getting Better,” which features the musings of over 150 thought leaders. It has been an interesting read so far. One of my favorites came from Martin Rees (Former President of the Royal Society), a scientist who once estimated “there was only a 50% chance that civilization would get through 2100 without a disastrous setback.” As un-optimistic as that may sound, he was still readily able to provide reason for hope. Lord Rees’ optimism springs from a host of opportunities, but he singled out clean energy as his top priority.