Linking the recycling of two carbon-intensive materials—cement and steel—could dramatically cut the climate impact of both, yielding a billion metric tons of recycled cement yearly by 2050, equivalent to about one-quarter of global annual production of this important building material and providing zero-emission cement. Cement is used to bind together sand, gravel, and water to make concrete. Concrete, responsible for about 7.5% of global greenhouse gas emissions, is the planet’s most-used material (behind only water). There’s more to be done, but it’s a promising start.
Climate Crisis Blog
