Mae fy swyddogion hefyd wedi gweithio'n eang ar draws llywodraeth, gan gefnogi gweithgorau datgarboneiddio ym maes Amaethyddiaeth a'r Defnydd o Dir, Adeiladau, Trydan, Diwydiant a Busnes, y Sector Cyhoeddus, Trafnidiaeth a Gwastraff i brofi'r rhagdybiaethau a'r dystiolaeth sy'n cael eu cyflwyno gan UKCCC a'u cymharu gyda'n gwybodaeth a'n sylfaen dystiolaeth bresennol. Rydym hefyd wedi dadansoddi tueddiadau hanesyddol mewn data allyriadau ac wedi asesu opsiynau yng nghyd-destun Adroddiad Tueddiadau'r Dyfodol, yr Adroddiad ar Sefyllfa Adnoddau Naturiol a chytundebau rhyngwladol ar y newid yn yr hinsawdd.
My officials have also worked extensively across government, supporting decarbonisation working groups in Agriculture and Land Use, Buildings, Electricity, Industry and Business, Public Sector, Transport and Waste to test the assumptions and evidence presented by the UKCCC and compare them with our existing knowledge and evidence base. We have also analysed historic trends in emissions data and assessed options in the context of the Future Trends Report, the State of Natural Resources Report and international agreements on climate change.