SUNITA NARAIN is an environmentalist and political activist who uses knowledge to push for changes in policy and practice. She has been with the Centre for Science and Environment since 1982 and is currently its director general. She is also the editor of the fortnightly magazine Down to Earth. For her tireless struggle for a cleaner environment in a fast-growing economy, Narain was included in Time magazine's list of 100 most infl uential people, in April 2016, where her profile was written by Amitav Ghosh. Hers was a compelling voice in Before the Flood, a feature-length documentary produced and presented by Leonardo DiCaprio and released in October 2016.