blog posts Illinois alum Charles David Keeling: The man who tied human actions to climate change Apr 30, 2018 8:45 am by Institute for Sustainability, Energy and the EnvironmentCampus LifeAlumni Share on Facebook Tweet Email Images Keeling was the first scientist to develop an accurate technique for measuring the air concentrations of carbon dioxide (CO2) — a greenhouse gas that traps atmospheric heat Share on Facebook Tweet Email