by Allen Williams
Concrete use is a 55 billion/year industry generating some 4500 metric tons of CO2 world wide.
One shortcoming of most of those estimates is that they report only a part of the cement industry emission, the one related to the calculation process. However, IEA estimates the proportion of the process emission to be two thirds  while Ecofys  estimates it at 55%. Data from our GNR database  confirms the 2/3. On that basis, total emissions from the cement industry can be estimated between 6-7% of world emission.
What s the 6-7% CO2 standard? Likely it’s a fraction of the world total of 4500 tons, in other words, so what?
4960 US tons x 2000 lb /.ton x 1 / 44 lbs / mole x 359 ft3 / mole (Std
conditions) = 8.097 E7 ft3 CO which doesn’t even hit the lowest rung on
the Human and natural sources of CO2 chart.
Beware of environmentalists using percentages to scare you on global warming. The whole of climate change is an elaborate scam to extract billions of dollars out of the gullible.