Nicole Hemmer is a political historian and the author of Messengers of the Right: Conservative Media and the Transformation of American Politics. We discuss the birth of conservative media activism, the different way conservatives understand truth, and their impact on American society.

Geoffrey Supran is a Research Associate at Harvard University, and co-author of Assessing ExxonMobil's Climate Change Communications (1977–2014). We discuss what ExxonMobil knew about climate change, its relentless campaign to deny the reality of climate science, and the importance of speaking truth to power.

Lenore Newman holds the Canada Research Chair in Food Security and Environment at the University of the Fraser Valley. Her latest book is Lost Feast: Culinary Extinction and the Future of Food. We discuss achieving food security through better management of food supplies, which include eating lower on the food chain and using technology such as artificial meats.