In this week’s episode of The Week in Sustainability, we explore groundbreaking research that reconstructs Earth's surface temperatures over the past 500 million years. The study reveals that the Phanerozoic eon, dating back to the Cambrian explosion, was much hotter than previously thought, providing a striking contrast to the current climate crisis. Asofsky highlights two key insights: the unprecedented speed of today’s warming and the direct link between atmospheric carbon and temperature shifts. With clear evidence tying fossil fuel combustion to modern climate change, she emphasizes the critical role of businesses in mitigating the impact.