Progressive Radio Network

Parts-per notation

The world is hurtling towards an era when global concentrations of carbon dioxide never again dip below the 400 parts per million (ppm) milestone, as…
Greenhouse gases could tip the Earth – or at least a planet like Earth, orbiting a star very like the Sun – into a runaway…
An insect form of Alzheimer's disease caused by aluminum contamination may be one of the causes behind an ongoing decline in populations of bees and…
When it comes to mercury contamination of seafood, scientists and environmentalists ring the alarm, warning consumers that eating too much fish can expose the body…