Sydney, Australia, is building a “green” road using geopolymer concrete. The environmentally friendly material is comprised of industrial waste from steel manufacturing and coal-fired power stations, specifically blast furnace slag and fly ash.

According to the city, geopolymer generates just 300 kg of carbon dioxide per metric ton of cement, compared to 900 kg in traditional concrete production. The carbon-emissions savings is equivalent to the electricity used by the average household every two weeks.

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