Of course the CO2 hysteria is all BS but the first thing that needs to be done to slow the growth of concrete use in this country is to start making road and bridge concrete in the US more durable.
Here in the rust belt winter road salt use destroys concrete and asphalt roads and bridges.
Typical, low cost concrete is porous to water. Water laden with road salt enters the concrete and eventually the salt recrystallizes and cracks the concrete.
Concrete mixtures can be made that are not porous. But they are more expensive. However, the reduction in road maintenance would more that make up the difference in lifetime cost of the road or bridge.
Just stopping the use of lime stone aggregate in road and bridge concrete would make a huge difference.
Back When, I watched a multi-ton paving machine actually get lifted off the ground because the mix it was trying to compress, distribute and smooth out was so stiff.
There are too many locally connected highway construction companies that depend on constant road repair and replacement contracts, let by someone's brother-in law with the county highway commission, for the US to build durable interstates, let alone secondary roads.
The Left/Climate types want to limit highway use to Party Members, anyhow, so CO2 outgassing is just another excuse.
Road salt destroys vehicles fast, too. I noticed that on much of the Colorado Rockies, no salt was used on roads. Sand and sometimes another chemical (don’t know what) were used on tight curves and switchbacks on passes. Ice tires made with new tech and directional tread work really well on any ice that vehicles can drive on at all—that is, as long as the ice isn’t too warm and wet for anything.