People worry that growing man-made carbon dioxide (CO₂) concentrations lead to climate change. Global models, use of observations, and datasets can help us better understand behaviour of CO₂. Here a tool to compute uncertainty in man-made CO₂ sources per country per year and month is presented. An example of all sources separated into seven groups (intensive and average energy, industry, humans, ground and air transport, others) is presented. Results will be used to predict CO₂ concentrations.