When Justin Bieber made his way to Stockholm in September 2016, city officials hardly expected the tween heartthrob to pave the way for sustainable urban policy .

Traditionally our electricity grids were designed to move power from large nuclear and fossil fuel power plants to consumers, but renewable energy will see changes to allow smaller power generation from wind and solar to be hooked up to the grid.

Nowadays, people do not expect to die as a result of a common infection like bacterial pneumonia. However, many do. Indeed, some bacteria have become resistant to all available antibiotics, due to overuse .

Tyres are well suited for recycling. They are easy to collect and do not require any costly sorting process.  However, in Europe, still only about 50% of the tyres are recycled .

Bacteria and other microorganisms that cause infections are remarkably resilient and can develop ways to survive drugs meant to kill or weaken them.