The average global cement production in the last decade has been 4.12 billion tonnes per year. For every tonne of cement produced according to the IPCC Report, there is a one and quarter tonnes equivalent of CO2 released. 4.12 billion tonnes of cement multiplied by 1.25 tonnes of CO2 per tonne of cement produced gives an eye-watering 5.15 billion tonnes of CO2 emitted from cement production each year over the last 10 years. To put it in context, if cement production were a country, it would be the world's third-largest emitter.