Carbon Dioxide (CO2) is the main human-generated atmospheric gas causing climate change, CO2 is dumped into the air every time fossil fuels (oil, gasoline, natural gas, coal) are burned. Individual people burn fossil fuels in their daily lives—by driving cars, using electricity, and eating animal-based diets—and the society as a whole burns fuels to run industry—growing food, manufacturing products, transporting goods. You can get a rough feeling for how much your different activities contribute to global warming by using this carbon calculator. By estimating your emissions, you can see how you compare with the “average” and think about ways to reduce your personal emissions. To reduce societal societal emissions will require collective actions to force industries, government, and institutions to reduce fossil fuel dependence and create alternatives.