Concrete

The Carbon Buster, a masonry block by UK firm Lignacite, is carbon negative, containing more carbon than emitted during production. It's made with over 50% recycled aggregate and uses Accelerated Carbonation Technology (ACT) from Carbon8. This eco-friendly brick captures 14 kg more CO2 per tonne than it emits, acting as a carbon battery. It will be available for use in projects later this year.