The Nile Delta salting up or going under the Mediterranean or the Nile River running dry would not affect the "warming is good" crowd much. When you get right down to it, they don't care what happens to people in Egypt, or Bangladesh, or sub-Saharan Africa. With the level of Islamophobia in this country some people think their demise would be a good thing. Religious evangelicals who believe the hookum that "we are living in the End Times" would just chalk it up as a prelude to the Tribulations. There is one thing that might - and I say might, because they could well say that it was part of the Tribulations, too - make them change their minds.The other point that is also missed by the deniers is food bowl production under threat in mass population areas like Egypt.
This is just one example of what is going on in the middle east and this an article that is 3 yrs old.
When you have mass population base starved of a resource then there are only two things that can happen. Mass migration or War neither of which can give any comfort to a denier.
The Jordan River is a kind of "canary in the coal mine" for global warming. The Jordan is a tiny little river that wouldn't even be a good sized creek in the U.S.A. or Russia. It exists only because Mt. Hermon is barely tall enough to have snow cover the year round. That snow cap has been getting smaller and smaller every summer for the last 20 years. One hot August not too far in the future the snow on Mt. Hermon is going to melt completely. When that happens the Jordan River will run dry. As hung up on the security of Israel that American evangelicals are, that might prompt them to reconsider the impact of doubling the atmosphere's CO2. But before that happens, we are quite likely to see a big Middle East war because Israel will find some pretext (if indeed they bother to justify it with a pretext) to invade Syria and gain access to the Euphrates.