These people could possible be arrogant enough, but I seriously doubt any of them REALLY think if the world was in such a state as to where Miami would be under water even in hundreds of years, anything they could do could prevent it. All this is simply a plan to siphon money off the low information public. At that, they may succeed.
They can take the money and claim victory for something that is not going to happen regardless. It is like stomping your foot to keep the elephants away.