Lessened snowpack in the Sierra Nevada mountains has some scientists worried about the impact on California's water supply, a third of which comes from those mountains.
The ban on drinking tap water in Toledo has been lifted, but there's worry that a dangerous toxin caused by algae blooms in Lake Erie will return this year. Continue reading →
In West Virginia the water crisis eases, but there are still gaps in protection.
Chlorine has a dark side, but giving it up is proving difficult.
The bacterial infection is rapidly outpacing efforts to help Haitians who are desperate for answers and solutions.