Are New Orleans’ post-Katrina flood defenses strong enough?

This 8.5 minute video from PBS Newshour explains the current situation in New Orleans. Experts examine the new man-made defenses, and look at the causes and impacts of delta erosion as well. - Lots of interesting Earth Science here.

Video of a Microburst near Tucson, AZ

To hear/see a TV meteorologist explain what causes a microburst CLICK HERE (Facebook). To learn more about what causes the air to get cold, CLICK HERE.