*cough*hubris*cough*

You might be right.

However, can you be sure that dry ice doesn't dissolve (even at a very slow rate) at those depths?
What about volcanoes on the ocean floor? (Too rare to be worth considering?)
What sort of effects might happen on a scale of decades or centuries?

My point is simply that such an important issue should be approached with a little more humility so we don't overlook problems.

...or suicide. I think that world sounds a lot more fun than the one I live in now. I mean, imagine a world where all people are fated to die from a disease at age 28. From the perspective of someone who will die from a disease at age 84, that sounds quite horrible. Such a world would be much less wise. Now imagine our pitiful lifespan from the perspective of someone who is 300+, and expects to live for at least another hundred years.