Mae'r penderfyniad yn dilyn canlyniad astudiaeth annibynnol a gomisiynwyd gan Lywodraeth Cymru i effaith carbon y gwasanaeth ar yr amgylchedd. Dangosodd yr astudiaeth fod y gwasanaeth wedi cael effaith fwy negyddol ar yr amgylchedd nag unrhyw fath arall o deithio rhwng Ynys Môn a Chaerdydd, oni bai ei fod yn hedfan yn agos at gapasiti llawn bob dydd, a fyddai, o ystyried y gostyngiad sylweddol mewn teithio ar gyfer busnes ers y pandemig, yn annhebygol iawn. Hyd yn oed pe bai pob awyren yn llawn, byddai effaith carbon y gwasanaeth yn sylweddol waeth na'r dewis arall ar y rheilffyrdd.
The decision follows the outcome of an independent study commissioned by the Welsh Government into the carbon impact of the service on the environment. The study showed the service had a more negative impact on the environment than any other form of travel between Ynys Mon and Cardiff, unless it was flying close to full capacity every day, which, given the significant reduction in business travel since the pandemic, would be very highly unlikely. Even if every flight was full, the carbon impact of the service would be significantly worse than the rail alternative.