Carbon capture, utilization, and storage can and should be a big contributor to geologic storage. However, the odds are growing that utilization could prevent it from being implemented at the scale needed to mitigate climate change. The reason is simple, and it is not what you are thinking! When Does Positive Plus Negative Equal Zero? A Field Guide to Decarbonization via Carbon Capture, Utilisation, and Storage describes the problem and will discuss how to recognize it, whether in the field or on the drawing board. Fortunately, some technologies needed for the journey to net-zero already exist, such as geologic storage of CO2. Also discussed will be the vital role of knowledgeable regulators if carbon capture, utilization, and storage are to reach their full potential for decarbonization.