Ym mis Ebrill 2019 Cymru oedd y wlad gyntaf yn y byd i ddatgan argyfwng hinsawdd ac ym mis Hydref eleni cyhoeddodd Llywodraeth Cymru 'Cymru Sero Net' - gan osod y sylfeini i wneud Cymru'n net sero erbyn 2050.
In April 2019 Wales was the first country in the world to declare a climate emergency and in October this year the Welsh Government published ‘Net Zero Wales’ - setting the foundations to make Wales net zero by 2050.