The goal of the MIT Climate Primer is to summarize the most important lines of evidence for human-caused climate change. It confronts the stickier questions about uncertainty in our projections, engages in a discussion of risk and risk management, and concludes by presenting different options for taking action. This site sticks to the facts and does not get into politics. We hope that the facts prepare you for more effective conversations with your community about values, trade-offs, politics, and actions.