@OnfromGambier @andyheald @SueHayman1 @Ed_Miliband @Keir_Starmer @James_BG Yes, supplying the heat to melt the rock/stone can only be achieved by burning fossil fuel, say gas or oil. Additionally rock wool does not store carbon unlike wood.

🐦🔗: https://nitter.eu/PaulBrannenNE/status/1558858236748595202