Paris offers a model to bring swimming to Charles River

Minnesota farmers are closely following the debate over how best to manage nitrates. Many farmers—no one knows the number exactly–are already taking action to lower their use of nitrates, which can contaminate water.

A new three-year project between the health department and the U.S. Geological Survey designed to improve the way arsenic, a carcinogen, is measured in private wells and to develop guidelines to help contractors avoid drilling high arsenic wells in the first place.

The amount of plastic debris in our oceans and water sources - especially nanoplastics that are increasingly prevalent in our food chain - is so enormous it's often beyond comprehension, and immensely difficult to address. As countries continue to industrialize and single-use products become more commonplace, the flow of harmful plastics into the environment seems insurmountable. But a number of clever inventions and dedicated individuals are working to help get plastics out of our water - and more importantly - encourage practices to reduce, reuse, and recycle.

Larger green spaces may be critical to a city, as they can support more complete ecosystems. In contrast to smaller "parklets," large parks paired with high-density neighborhoods allow for healthier cities.

Poor neighborhoods in the United States lack quality play spaces for children, also known as play deserts. An organization is enabling communities across the nation to build their own playground.

Great minds from Plato to Piaget have recognized the importance of play in healthy child development, but with bullying becoming more prevalent on school playgrounds and increased pressure to maximize school hours to boost performance on standardized tests, schools are struggling to implement meaningful recess. Playworks and other similar non-profit groups provide coaching for adults on how to help structure children's playtime to be healthy, productive, and enjoyable, while allowing children to explore on their own and develop positive relationships.

Clean water and healthy ecosystems are becoming increasingly difficult to come by. With floating islands and other inventions, eco-entrepreneur Bruce Kania thinks that biomimicry - such as reconstructing wetlands and growing biofilms - can tackle the toughest of water problems.

Property rights, circumscribed jurisdictions, and conflicts with neighbors exacerbate Native American efforts to restore tribal land and resources. Some tribes have found success by tapping into a trend of support from the government and conservationists.

Prescription drugs are greatly polluting the national water supply, causing researchers to begin looking for a method to better filter water and dispose of unused medicine.

Despite strong evidence that school-based physical activity improves children’s cognitive skills, concentration, and behavior, schools under pressure to produce quantitative results and decrease bullying have drastically cut back on recess in recent years. An Oakland-based nonprofit organization called Playworks is working to make healthy play accessible for more children and show schools how productive recess can be to the whole academic world.