Algae is turning Rio's pools a frightening shade of green.
As ocean temperatures have risen, so have the number of lethal bacteria that cause the waterborne disease.
The push for protection is partially attributed to anxieties around the Zika virus, which is sexually transmittable.
The disastrous switch from Lake Huron to the Flint River as the city's water source will cost it nearly $460 million.
The oil and gas industry is already fighting back.
It's a bad time to be a coral -- still.
U.S. court rules Chevron won't have to pay Ecuadorians for decades of pollution.
We just used up a year’s worth of natural resources.
In hot, polluted places like Rio, you’re actually better off just having a beer than exercising. Really.