This past July, in the dusty basement of a building in Seattle, Washington, about 60 tons of concrete were poured as part of the renovation of a historic building. To an outsider, it looked like just another job site. Even to the workers pouring and shaping the concrete that day, it was more or less business as usual. In fact, the messy, decidedly unglamorous occasion marked a milestone in the race to reduce gigatons of global CO2 emissions. That’s because the concrete was made using a more sustainable binding material…
