Glass is mostly made of melted quartz sand, so even if the bottle somehow sinks, or gets cracked and shatters, the glass will naturally weather and erode away along the rough sea floor, until the sharp edges wear away and any large pieces essentially become smooth and rounded, almost rock-like, and the weathered particles will pretty much return to it's original sandy state over time. (think of the sandy/rocky sea bed as acting like sandpaper on the glass).

If the bottle survives intact, it'll probably turn up somewhere after a few years, and hopefully in the hands of a lucky finder.

I can understand the concerns if plastic bottles were used, because of the environmentally unfriendly chemical components, but glass is totally inert, and is about as safe as you can get for something like this. Best-case scenario, people have an adventure discovering a message from a faraway land, and in the worst-case scenario, you've recycled some sand to the ocean.

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