The worst part about gas are all the leaks on site. Once it’s in the air, you can’t get it out. Often they don’t even burn the gas and just let it leak straight into the atmosphere. And we didn’t even get to liquifying the product or address the environmental cost of fracking for example. Meanwhile when coal falls off an excavator you just pick it up again.
If you care about the environment, go renewable. Gas isn’t magic and sugar coating won’t clean coal.
What castle is this supposed to be? The tower section looks absurdly oversized to be medieval. Even the most fortified crusader castles never reached dimensions like this. Seems to be more fantasy than history to me.