Eric Walker added The Anthropocene epoch: have we entered a new phase of planetary history? | Environment | The Guardian and Have we entered the "Anthropocene"? - IGBP to Paul Crutzen, and added Paul Crutzen to Chemists

Eric Walker added Paul Crutzen to Chemists, and added Chemists to Scientists, researchers and academics and Chemistry

Eric Walker added a number of topics to Scientists, researchers and academics, and added Scientists, researchers and academics to People

Eric Walker added a number of topics and a number of links to Chemistry, and added Chemistry to Science, engineering, mathematics and the humanities