In Wales, demanding targets to limit carbon emissions are enshrined in the Environment (Wales) Act 2016 and the legislation made under it.
Yng Nghymru, mae’r targedau caled i gyfyngu ar allyriadau carbon wedi’u hymgorffori yn Neddf yr Amgylchedd (Cymru) a’r ddeddfwriaeth a wnaed drwyddi.