There was an anime I remember seeing when I was a kid, on either Fox or ABC Saturday morning cartoons. It was mostly about this boy from a town that was either out in the desert, or the world had turned to desert, and the town was trying to make it by. The boy has a little creature companion that reminds me an awful lot like the Kuribo monster from Yu-gi-oh. The boy and his pet go out into the desert for some reason and encounter large creatures that basically look like over-sized brown woolly cotton balls on three really long legs. They basically save the boy, and he learns that his little companion is like a juvenile of those large creatures, and he has to say goodbye. But then at the end of the show, the earth has begun to heal, and there are plants and water, and one of the creatures goes up to a human, and is recognized as being the companion all grown up.
Can anyone help think of the name of it? Thanks in advance!