A couple of weeks ago I scrolled through my 50 some emails of the day and was struck by one from Crowdrise. The subject line read “Have you saved an animal from extinction?” It was a 24 hour emergency campaign to save the Greater Bamboo Lemur in Madagascar. I glanced, saw there was video, and hit delete. The world is too big, I told myself, and I know too much already about the suffering of humans, animals and the planet itself. But the question has hung in my mind and led me to think about activism. How do we choose what to spend our time and energy on? How can we be most effective?