One set of policies that have been suggested to address climate change are carbon prices. Pricing carbon makes it more expensive to make polluting or unsustainable choices and less expensive to make cleaner or sustainable choices. This article explains why, if well designed, carbon prices can provide systematic signals to the market and make societies fairer. The article also defends carbon prices from several objections.

We quite often play the game of wondering what our older self would say to our younger self. Usually by way of advice. Mistakes to avoid. This seems true. But here it is suggested that our younger self may have important things to say of a similar sort to our older self, and in a sense can by our remembering when older what we were like when we were younger and what mattered to us. The process of wondering what might be said goes both ways.