[dheera]

Thanks for the explanation!

Follow up -- Considering that at some point we'll reach saturation in the amount of buildings we need, and the world population will necessarily stabilize itself due to resource limits, are there other ways to take CO2 out of circulation besides concrete that don't come with the additional emissions of concrete?

For example I believe plants make sugars using CO2 and water? Can we make a ton of sugar (or other environmentally safe molecules) artificially using CO2 and bury it in the desert? (Sorry for my naivity, I'm not a chemist!)

[paulgross]

Absolutely. The main answer is going to be permanent geologic storage in depleted oil wells or saline aquifers, which is widely agreed to be one of the most scalable form of carbon sequestration. We're also hoping to turn the CO2 back into fuel right at the truck stop, so we can put it right back into the trucks!