Not just the Netherlands, Maranta. A large area of Yorkshire, East Anglia and Lincolnshire would also disappear, including a lot of large cities.
It's well known that most of Hull is below sea level. That's why they've had the Humber Barrier for so long.
I hadn't realised that the Wash area right up to Peterborough was so low, although Ely is the only city at any height there.
Yes, I worry about climate change. Have done for a long time, since I studied environmental science in the seventies. Just received a card from a couple in their eighties who live in Cumbria near Cockermouth. They are certain that manmade global warming is to blame for increasingly wet and windy winters to that area.