London / United Kingdom
It's called Celour and it's a paint that captures the CO2 it detects in the air and, to make matters worse, is made from waste generated by cement, waste that until now was not reused. The proposal has been developed by Kukborg Kim, a former student of the Royal College of Art and the Imperial College London.
To this day, cement waste was normally buried in landfills, where it could seep into the ground and damage the environment. But as this student has discovered, when this residue mixes with the paint, it produces a mineral carbonation, forming stable carbonates by the reaction of CO2 with the minerals in the cement. A process that effectively captures carbon from the air and is already beginning to be used in CO2 sequestration projects. Once applied to a wall, Kim claims that paint is capable of sequestering 27 grams of CO2 for every 135 grams of paint used. Kim also claims that painting can allow carbon to be closed almost indefinitely, unless exposed to extreme heat.
In addition, by using Celour, you can not only actively capture CO2 from the air, but also decrease the carbon emission that occurs when making new cement, suggesting that Celour may be the first step in recovering the pre-industrial atmospheric levels. It is estimated that the cement industry contributes up to 7% of global CO2 emissions.