Climate change: The massive #CO2 emitter you may not know about - BBC News
▻https://www.bbc.com/news/science-environment-46455844
Not only does the production of Portland cement involve quarrying - causing airborne #pollution in the form of dust - it also requires the use of massive kilns, which require large amounts of energy.
The actual chemical process of making cement also emits staggeringly high levels of CO2.