【As a Tokyoite who was born and raised in Tokyo city.】

It should be an obvious thing that sooner or later, an earthquake which is as big as the Great East Japan Earthquake, or even bigger than it will occur in Tokyo. Tokyo's whose population is over 13,000,000 (as far as I know), and which is often called the biggest city of Asia. If an big earthquake which I'm talking about occurs, how many people will be killed?..How much will our living environment that is much more convenient than everyplace else will be changed?..And what will happen to Tokyo and our country, Japan? Perhaps, everything will overwhelmingly be changed...I don't think that it doesn't make sense, but we can't be too worryied too much about it because what we can do now is only to prepare for it an big earthquake!

SO

WE MUST MAKE SURE THAT WE MUST PREPARE WELL FOR IT!

Does what I said make sense?

Yes it makes sense, but it is not natural in some places so I changed some words and phrases for you.

Hope it helps.

お疲れ様でした。よろしくお願いします。