Climate change: UK breakthrough could slash cement CO2 emissions

5 hours agoJustin Rowlatt,BBC climate editor , @BBCJustinRGetty ImagesScientists hope to clean up cement makingScientists say they've found a way to recycle cement from demolished concrete buildings.Cement is the modern world's most common construction material, but it is also a huge source of planet-warming gas emissions. That is because of the chemical reactions when you heat limestone to high temperatures by…