These disasters defined a decade. For this list, we’re looking at the most devastating and deadly storms, earthquakes, tsunamis, floods, mudslides, heat waves and other natural phenomena the planet experienced from 2000 to 2009. Our countdown includes Hurricane Katrina, 2001 Gujarat Earthquake, 2004 Indian Ocean Earthquake & Tsunami, and more! Let us know in the comments which of these events you’ll always remember.