A'r man cychwyn, wrth gwrs, pan ŷch chi'n darllen y Ddeddf—rhyw fath o gynsail neu sylfaen i'r cyfan—yw Deddf llesiant cenedlaethau'r dyfodol, sy'n gosod allan y pedwar piler yna o ddatblygu cynaliadwy yma yng Nghymru.
And the starting point, of course, when you read the legislation—some kind of foundation for all of it—is the well-being of future generations Act, which sets out those four pillars in terms of sustainable development here in Wales.
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