These maps have gone viral – here’s what they owe to 19th century cholera campaigns.

Rising concern about possible environmental damage from the active ingredients in sunscreens could have ripple effects on public health if it causes people to use less of them.

Climate change is colliding with old factory sites where soil or water contamination still exist, and the most vulnerable populations are particularly at risk.

Nutrient pollution fouls lakes and bays with algae, killing fish and threatening public health. Progress curbing it has been slow, mainly because of farm pollution.

Belfast needs to rid its infrastructure of lead water pipes and raise public awareness of the serious health issues caused by excess levels of lead in the water.

Cleaning up the Great Lakes was a big job when the US and Canada undertook it in 1972. Today it’s far more challenging.

The inside of story of a pioneering programme to convert nitrogen into microalgae that can generate sustainable animal feed.

Pollution from more frequent floods and wildfires – exacerbated by the warming climate – is threatening human health and poses particular risks to the brain.

Offshore oil drilling has a long history in California, but is highly unpopular today. The latest major spill is likely to fuel efforts to wind down oil and gas production statewide.

Rivers are among among the most embattled ecosystems on Earth. Researchers are testing a new, inexpensive way to study river health by using eDNA to count the species that rivers harbor.