This is a story about how the world’s most powerful industry used science, communications, and consumer psychology to shape the public debate over climate change. And it begins earlier—decades earlier—than anyone suspected.Explore our documents and discover what they knew, when they knew it, and how they collaborated to confuse the public, promote scientific theories that contradicted their own best information, and block action on the most important challenge of our time. [Refers to Chevron, ExxonMobil and Shell]