No, no, no
The “connotations” of “beacon” seem to be entirely misrepresented. Nothing to do with carbon emissions!
I have no quarrel with using the Welsh version of the name as an option but do the environmentalists also wish to rename Beaconsfield, Minehead, Coalville.etc?
They do not see to understand the derivation of (Beacon” which comes from Old English bēacen, bēcen, bēcn “a sign, portent; a standard, banner; a signal, signal fire, signal hill or tower, watchtower; lighthouse.” )
The reason it was a fire long ago was, guess what, because they hadn’t invented LED bulbs 
It gets sillier by the day!