For the past twenty-five years, Mark has focused his investigations into the ecological fate of the earth, food security, poverty and agriculture. He also writes on the national security state. Mark is the environmental correspondent for The Nation and reports on ecological issues for Vanity Fair, The New Yorker, Time, Mother Jones, Die Zeit and other publications and appears as a regular commentator on PBS Morning Edition and Living on Earth. He has published six important books, including “Hot: Living Through the Next Fifty Years on Earth.” His most recent is “Bravehearts: Whistle Blowing in the Age of Snowden.” His website is MarkHertsgaard.com