'The Crown Estate owns around 615,000 acres of the UK, the Duchy of Lancaster 45,000 acres, and the Duchy of Cornwall 130,000 acres. Further land privately owned by the Royal Family totals over 70,000 acres. This all adds up to roughly 1.4 percent of the UK, an area twice the size of greater London, and includes plenty of urban property as well as farms, forests and moorland. The Crown also owns the seabed within the country's territorial limits, and receives billions of pounds for graciously allowing offshore wind farms to be built out there.' - https://www.thelandmagazine.org.uk/articles/duchy-subject
He can pay lip service to green ideals as much as he likes, when it comes down to it he will leverage it to maximum gain, stuff the consequences. And forget about him ever endorsing the kind of environmental politics that views land reform & wealth re-distribution as essential for undoing the centuries of enclosure, dispossession and forced migration to the cities which the ruling elites (including the monarchy) were always instigating.