4 ms·

Concrete production actually does have crazy CO2 emissions. Wikipedia says it's up to 5% globally: https://en.wikipedia.org/wiki/Environmental_impact_of_concre

• logicallee 9y ago
  That's shocking. The Wikipedia page gives a 2002 reference (for the sentence you cite), so I guess in order of magnitude it must be correct. It seems to say that the reason for this is that it must be heated to absolutely insane temperatures, which is, obviously, energy-intensive. 5% is huge though. I still have trouble believing it. I wish I could see a pie chart with the major sources of CO2 emissions. After things like cars, planes, factories, POWER GENERATION, etc, I would have thought those were the major ones. if you Google "pie chart of co2 emissions" it's hard to see where just concrete fits in. Oh well.