Actually when you consider the global implications of climate and the local effects of shore, a local area using local money to protect local shore in the face of global inaction they are powerless to change makes perfect sense.

It is actually your position which makes no sense. "Hey 4.6 million Louisianans, sure you're only 0.00063% of world population, but protecting yourself and your land from what the other 99.9994% do is futile, you must instead convince the other ~7.1 billion humans to change so your land will be safe!"