10th of September was a natural but unfortunate occurrence, that devastated a lot of lives in the USA, the year 2005 has been called the year of extreme weather because of the a series of natural climate occurrences (scorching summers that ignited forest fires in Spain, devastating floods in Romania, Germany; tsunamis in Japan); these events were probably caused by the ‘green house affect’ and global warming
September 10th was a natural and unfortunate occurrence, it does not compare to September 11 that was a terrible tragedy caused by a group of people crashing 2 Boing 747 in the WTC.