Natural history, interpreted through the geological and paleontological records, has taught us that impacts of near-Earth objects (NEOs) pose a serious threat to humankind. Astronomy tells us that it is practically inevitable that Earth will be struck by a globally or regionally civilization threatening NEO in the future. The good news is that given sufficient warning there’s a good chance this threat could be mitigated if the people on Earth act collectively and decisively. The organization best suited to coordinate NEO mitigation efforts is the United Nations. That is why John L. Remo called for and organized the UN Conference on Near –Earth Objects in 1994. It’s now time to look back and see what has been achieved in the past twenty years and where we should go in the future.
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