"Any flooding that does occurr will take place very slowly"
Didn't they show the floods in Bangla Desh and Mozambique on your news broadcasts? And if that was your child being born in the middle of a flood on the top of a tree?
And I know it's complicated, and there are scientists who can be bought to argue on the side of the people with money. The same way you had scientists who'd claim that cigarettes didn't cause cancer. And there are very likely other factors at work, including a lot that we don't begin to understand.
One reason for floods isn't pollution, it's deforestation, as has been pointed out. And the people ultimately responsible for that are in big offices in North America and Western Europe, and out buying stuff in DIY shops and so forth.