This document outlines a talk about natural limits to economic growth. It introduces key concepts like exponential growth curves and logistic growth curves. It then provides a whistle-stop tour of economic history from hunter-gatherers to modern consumerism. It notes that past civilizations collapsed due to environmental degradation. The current situation involves ecological crisis, energy issues, agricultural problems, and climate change. Our civilization is complex and not immune to collapse. The document considers what can be done, like adopting a powerdown approach globally and transitioning to more sustainable local economies.