What's slow, unsafe and is holding back development opportunities in low-resource countries? Cash, according to the Better Than Cash Alliance. They want to make money completely digital - and by doing so, make the world more economically and socially sustainable. Read on

A road surface that generates electricity from sunlight, absorbs noise, breaks down nitrogen oxides, defrosts ice in winter, provides valuable data and supplies electric vehicles with electricity. Sound too good to be true? It's true, and it's here. Read on

A Swedish spin-off from car and plane manufacturer SAAB is seeking to turn underwater planes into green power producers. And it’s already proven and close to being commercially viable. How useful can it be for the world? Read on

In Nigeria, social enterprise WeCycle is taking recycling into their own hands - heading out on bicycles to pick up waste from those people who have been forgotten by the city's collection services. Read on

A company in Chile has developed a bag that dissolves in water within five minutes. Could this mean the end of the billions of plastic packages that end up in our seas every year? Read on