South Asia is a really difficult place to try and centralize the countries. A big problem are the large populations in the countries, with the likes of India, Pakistan, and Bangladesh all being in one of the most populated countries in the world, so centralizing them would mean that hundreds of millions of people will either live on the verge of existence (even worse than it is now), or will be moving towards the city where the centralization will be taking place, and there's no such place that can function properly if that amount of people flood in it. Another problem is that there's multiple cities that are very big, with millions of people living in them, and if centralization takes place, they will start to decline in every aspect, and that will cause huge problems of all sorts on national level.
Evacuate from potential storm tide inundated areas evacuate from areas not at risk of inundation seek shelter with family and friends in the community evacuate the area and travel beyond the cyclone warning zone require assistance to evacuate and the extent of assistance required.
If rat tailed maggots and great beetle were wiped out then they would be two much of the predators and prey then the whole population would be wiped out completely and the food chain would be destroyed if there were all wiped out.