Earth Day is a celebratory affair. It’s about appreciating the planet that we live on, and all of the goods and services it provides. In many ways, it’s a celebration of just being alive. But Earth Day is also a time for reflection. It’s a time to take stock of our planet’s health, and in turn, our health. Unfortunately doing so is always going to be uncomfortable, because we tend to be pretty good at destroying things. So let the self-flagellation begin.