The Stage 3 Economic Assessment Report indicates additional carbon costs compared to the Do-Minimum of £219,000 for Junction 15 and £199,000 for Junction 16.
Mae Adroddiad Asesiad Economaidd Cam 3 yn nodi costau carbon ychwanegol o £219,000 ar gyfer Cyffordd 15 a £199,000 ar gyfer Cyffordd 16 o gymharu â'r ymyriad lleiaf posibl.