[KirklandJunction]

I wonder: when asbestos was banned, why didn't the builders go back to using concrete? Anybody know?

[dely2]

Profit motive. It was cheaper.

It's silly to try to blame all this on liberals. They were doing the best they could to protect lives and prevent disease, given the available data and the scientific understanding of the time.

[randog]

...when asbestos was banned, why didn't the builders go back to using concrete?

Pure speculation, but perhaps concrete insulation couldn't be used on WTC because of the height of the buildings, i.e. the concrete would have added too much weight and destabilized the building.

[bobg]

Concrete is too rigid for a very tall building. Needs to be flexible to flex in the wind.