Thank you for your reply, OK if not the Moon where? The point I was trying to make is that I think we should seek a better solution than simply pollute the Earth by deorbiting the ISS to the bottom of the ocean. With the new rocket technology coming on stream (SLS, SpaceX heavy) the tonnage they can carry is considerably increased so I doubt it would cost as much as you suggest. Nevertheless, money (as always) does remain a problem but some thought should be put behind preserving Space historic artefacts, after all the ISS is the largest object that mankind has constructed in space. Regarding the legal treaty I don't have the knowledge to comment on that but humans are planning to return permanently to the Moon shortly so we will be building there anyway but, of course, we should be careful in what we do. I disagree with you about the future scientific value of the ISS - even without further human intervention the 'life' on the ISS (Bacteria, fungi, etc.) would provide us with an experiment to see whether it flourishes, evolves or not in space.