sentences:  Damage to the ozone layer has resulted in much higher levels of UV light and so sunburn and skin cancer are serious issues – most people do not venture outside unless entirely necessary, and carry high factor suncream and anti-cancer kits.Most of the world's population were wiped out in "God's flood"; the survivors live in collections of floating oil-platform-like city structures, known as parishes.The story takes place around the seas and drylands that were once Scotland – initially "Port", a collection of parishes (named after towns around Scotland) attached to what was once Greenock by underwater cables.