The bystander effect

We tend to believe that someone else will deal with a crisis. 

This developed for good reason: if a threatening wild animal is lurking at the edge of our hunter-gatherer group, it’s a waste of effort for every single member to spring into action. Today, however, this leads us to assume (often wrongly) that our leaders must be doing something about the crisis of climate change. And the larger the group, the stronger this bias becomes.