Earth Day is coming on April 22, but the whole month is seen as an opportunity to think about environmental issues and what we as individuals can do to help out. 

It seemed like a good time to rerun an episode we made with Harvard professor Dan Gilbert about why we humans are great at tackling immediate threats, but find it harder to motivate ourselves to address problems that seem a longer way off. It's why we often don't save for our retirements, and why we're finding it difficult to take action on climate change.