With creationists arguing over its formation, and lengthy disputes over land rights, the Grand Canyon has often been the focus of controversy. Now a row has broken out just days before the start of an experiment designed to repair environmental damage to the area.
Since 1963, a nearby hydroelectric dam has restricted the flow of the Colorado river through the canyon, causing sediment to build up behind the dam, and sandbars downstream to erode more quickly. Non-native species, such as the channel catfish, have prospered in the new conditions, but the number of humpback chub, a fish unique to the…
