How technology can make the world a cleaner, safer place

This week's edition of the Upside series looks at the use of new tech to fight dirty money, sexual harassment and pollution

Our world is full of persistent, apparently unsolvable problems that often stem from the type of behaviour that can shake our faith in our fellow human beings. But amid that gloom, the advance of technology is one of the great and renewable sources of hope. And while technology alone can never provide all the answers, history is a story of breakthroughs and revolutions triggered by all manner of scientific discoveries.

This week, we present to you: tales of how technology is being leveraged to tackle some of our most demoralising problems.