Japan’s Taisei makes concrete with lower CO2
Cement is responsible for 7% of global GHGs. If it were a country, it would be the third largest emitter. behind only China and the US.
Buildings
Solar panels on 50% of the world’s roofs covers 100% of all electricity demanded
This ignores the need for power when the sun doesn’t shine, but counters the argument that solar needs an unreasonably large footprint.
Primer on HEAT … for buildings, water and industry
Transportation and generating electricity account for > 50% of GHGs. Heating for buildings, water and industry creates 29% of GHGs globally. Here’s a good overview on current sources of GHGs from heating and clean alternatives.