Thanks for your question! The reason the A4 impacts are proportionately so high is because the template is still assuming that you’re transporting a whole concrete truck to site to pour 1m3 of concrete. This is clearly unrealistic. However you would also never only have 1m3 of concrete for a typical construction project. Therefore when you compare templates in your test design, please ensure that you model a larger quantity to give you a more accurate A4 figure. After adding the larger template quantity to your design, you can divide the results with the total m3 quantity you’ve modeled to give you a more accurate kgCO2e/m3 figure.