There are millions of tonnes of plastic in our oceans, but we can’t find it. Marric Stephens investigates how we’re searching for this elusive missing waste
Researchers find plastic beads, fragments and fibres in ecosystems from the peaks of the Sierra Nevada to the depths of Long Island Sound, with uncertain health effects
Can drones be used to map radiation levels around the Chernobyl nuclear site? Peter Martin and Tom Scott visit the exclusion zone surrounding the plant to find out