[imr_]

Hence the definition of sinking...

[Someone]

”To sink” has multiple definitions, one of them ”to fall or drop to a lower place or level” (https://www.merriam-webster.com/dictionary/sink)

[choward]

Good point. The "so fast" part actually means nothing.

[forinti]

Maybe they meant it's so fast there's no time to do anything about it.

[Sylos]

Yeah, it's not easy to convey how pressing the issue is by just stating that Jakarta is sinking, but that really is a surprisingly dumb headline for an otherwise solid article.

[dang]

"Sinking" is used in the third sense of http://www.dictionary.com/browse/sink?s=t. The headline is just fine.