The Trump administration is supporting new mines in Alaska and Minnesota that many opponents say could devastate sensitive areas around them.
As climate change speeds up tropical storm cycles, rivers and bays have less time to process nutrients and pollutants that wash into them after each event.
We all know that climate change is hurting the Great Barrier Reef. But scores of other less-publicised threats also threaten the future of the natural wonder.
Should lakes, rivers and other resources have legal rights? New Zealand, Ecuador and other countries have taken this step. Now Toledo, Ohio is a US test case.
A proposed plan to clean up New Zealand's waterways draws clear limits on the expansion of dairy farming and irrigation, as well as on the use of nitrogen fertiliser in some key areas.
Many remote communities in Australia's north rely on bore water. But a new microbiology analysis suggests that the chemistry of untreated water can allow disease-causing bacteria to grow unchecked.
A grade of 92 is an A at most schools, but for tap water it means that millions of Americans drink water that fails to met federal standards.
Freshwater data in the latest report on the state of New Zealand's environment suggest improvements in water quality are possible but many gaps in understanding remain.
Scientists are finding ways to generate something useful from the pollution in our environment.
Gas mining is expanding across Australia, and has been touted as part of the answer to cutting emissions. But there is evidence that this rollout will pose significant health and environmental risks.
The 'used water' that flows from our showers, dishwashers and toilets isn't a waste to engineers – it contains valuable materials. The challenge is recovering them and turning them into products.
EPA is moving to regulate two chemicals from a group called PFAS that are contaminating drinking water. A public health expert explains why the agency should take much broader action.
Bankrupt oil and gas companies must clean up old wells, yet taxpayers are still stuck with the bill for abandoned mines.
Snorkeling off the California coast, a high school student found heaps of golf balls on the ocean floor. With a marine scientist, she showed that golf courses were producing tons of plastic pollution.
Fertilizer is a key source of nitrogen pollution which fouls air and water worldwide. Current regulations target farmers, but focusing on producers could spur them to develop greener products.
A few decades ago Boston Harbor was one of the nation's dirtiest water bodies. Now, healthier fish in the harbor underscore that a multibillion-dollar cleanup has succeeded.
Harmful pesticides have been found in the widely consumed sharptooth catfish found in a river that runs through Johannesburg.
When people form local networks to take care of resources such as drinking water, they strengthen their communities. Technology can support these efforts and promote learning and innovation.
South Africa needs to strengthen its response to plastic pollution.
South Africa's local governments lack a clear separation of legislative and executive powers.