Living Planet

More and more cities are switching to LEDs to save money and, ultimately, the planet. But ecologists are worried about this trend. Dr. Chris Kyba explains why on a night walk through Cologne, one of Germany's brightest cities.

In the heart of Berlin, woodpeckers are turning the city into their playground. From drumming on trees to carving out homes, these master carpenters are thriving in the most unlikely of places. But why are they drawn to the bustling streets and towering buildings?

Not long ago, energy analysts noticed something weird in the data they were tracking. The anomaly centered on Pakistan. All of a sudden, the country seemed to be using far, far less electricity than before. What the analysts would discover baffled them – a different kind of power surge brewing elsewhere, right under their noses. One that could have ripple effects far and wide. If it isn't halted.

Thousands of ships loaded with oil were sunk during the fierce sea battles of the Second World War. That means they’ve been sitting underwater for eight decades, with no maintenance or protection. Scientists fear many of these wrecks are now close to collapse — and that a spike in catastrophic oil spills may be on the horizon.