If there was an advanced fully eco-friendly civilization in the past, we wouldn't even know they existed.
If there was an advanced fully eco-friendly civilization in the past, we wouldn't even know they existed.
...
If there was an advanced fully eco-friendly civilization in the past, we wouldn't even know they existed.
...
Ireland!
Genuine question: Is building houses from stone considered not Eco-friendly?
Oh, sorry, don't know where the capital E came from. I'm sure Umberto wouldn't mind houses of stone.