The Colorado River Basin's underground water supplies are shrinking faster than they're being replenished.
Aerial photos of the Colorado River pulse flow reaching the Gulf of California.
In West Virginia the water crisis eases, but there are still gaps in protection.
Australian researchers said Thursday they had established the existence of vast freshwater reserves trapped beneath the ocean floor.
When a hurricane passes over fresh water, the storm can intensify up to 50 percent faster than a tempest traversing saltwater.
Cutting carbon emissions soon could help save mountain snowpack, and so wolverines, in the northwest United States.