Think you should find out which type of islands these are, I do. Yes, do some research, you must.
Yoda aside. Ask yourself what made these islands in the first place. Given the fact that these are not made from geological formations, but they still managed to grow just above sea level, what will prevent it from continuing to do so?
I have absolutely no problems with people taking different sides in a scientific debate, but when you say something like:
"I know these are complex subjects and the author may not grasp it, but I'll try and explain."
"Consequently, it makes absolutely fuck all difference how WIDE the island is to prevent sea-level from inundating it."
and in process contest an associate professor and the magazine New Scientist which have chosen to publish an article about the report, then you better have something major to back it up with. At least I expect you to have a rock solid scientific background, which of course you might have, and have read the report and articles referring to them at least three or four times and checked their references etc. It is simply not enough when all you have to come with are a thesis why something somebody have gone out and actually measured can't possible be true. It really doesn't help when your thesis is based on these islands being of a completely different type than they actually are. When you on top of that are so arrogant about it makes you look like an equus asinus. Did you even read the article in New Scientist?
I am so, like totally, fed up, of people that can't bring an open and inquiring mind, and a civil tone to a scientific debate. It does however help to stoop to their level for a period of time equal to the time it takes to write a response. Yes, take my hat and coat and leave, I will.