As atmospheric carbon dioxide levels climb higher than they have been in the last two million years, we face the challenge of adapting to and mitigating the effects of climate change. How do we know that humans are responsible for climate change? What effects of climate change can we see already? How can geology help understand what a future warm world might look like? In this talk, Dr. Tierney will take us through the past, present, and future trajectory of Earth’s climate and discuss how paleoclimatologists query the ancient record of climate change to improve our understanding of the future.