Cambrian

This Old World: In Contemplation of Earth Day

This Old World:  In Contemplation of Earth Day

On Earth Day last year, I was thinking about the health of our planet, but also about its age and the changes it has been through. I also thought, as I sometimes do on Earth Day, of the scientists who have been documenting the evolving nature of our airy, watery, rocky world that has the moving parts of a fired-up dynamo below its crust.