Here is another captivating video on science from TED, specifically on Fresh Water. Remembered that I once shared a post on Math Magic. With a direct presentation on the facts (covers generally with more on American's) added with simpler graphics, this may help a lot for kids to acquire foundation knowledge on it. Interesting way of learning.
Next on my watch-list is a 2+ hours of collection of Talk to Watch with Kids.
Have I not said that TED programmes is waaay better than idiot box?