Concrete is the real environmental villain because of heat retention and CO2 emissions created in it's manufacturing (#3 source of all man-made CO2) Manufacturing of the steel re-bar to support concrete's weak tensile strength is is't own ecological nightmare.
Many an eye has been poked out by steel re-bar; and it can be used to make assault weapons,
Additionally, we have reached "Peak Sand" already and supplies are scarce.
We will not need more energy if we ban all transportation immediately.
Let's GO GREEN and enjoy our last 12 years.
Edited by Rogerdodger, 03 April 2019 - 05:11 PM.