Cement production is a huge source of carbon emissions with no green alternative, but a new process that uses waste from demolished buildings could dramatically reduce its climate impactCement production is a huge source of carbon emissions with no green alternative, but a new process that uses waste from demolished buildings could dramatically reduce its climate impact Cement production is a huge source of carbon emissions with no green alternative, but a new process that uses waste from demolished buildings could dramatically reduce its climate impact New Scientist – Home