Question: What documentary did the environmental writer for The Guardian work on?
Sentence (from "The Planet (film)"): It includes interviews with 29 environmental scientists and experts including Stephen Peake, Herman Daly, Lester Brown, Gretchen Daily, Mathis Wackernagel, Norman Myers, Jill Jäger, George Monbiot, Robert Costanza, Will Steffen, and Jared Diamond.
Relevant evidence: Yes