“Green” measures nothing. Which is greener: a building that saves water or a building that uses certified carpet? There is no obvious answer to this question - this is why trying to quantify “green” is biased and leads nowhere. Using carbon as a metric, on the other hand, makes sense. This is something you can accurately measure and therefore reduce. Going “low-carbon” not only contributes to fighting climate change but also totally redefines construction (choice of materials, energy sources, etc.).

This is why shapedearth.com, the first free online calculator for assessing the whole life embodied carbon of building projects, is such a useful tool.