Tesla has spearheaded the development of electric mobility. For a long time, the world’s largest automaker, Volkswagen, was content to stand by and watch. Now the group is playing catchup, pledging to switch increasingly to all-electric.

Green and car-free: That's what many would like for our inner cities. Parts of Copenhagen and Barcelona are already there. But we don’t just need more pedestrian zones. Tomorrow’s cities should be places where we shop, work and live.

For six months now, thousands of Indian farmers have been besieging Delhi with a protest camp. Their colleagues in Germany also stage regular demonstrations in central Berlin. We hear why they all feel mistreated by their governments.

Ten years ago, 74 member countries of the United Nations gave themselves an enormous task: to restore 3.5 million square kilometers of the world's rainforests by 2030. But how exactly will that be possible?

We tend to throw an awful lot of things away. They end up in landfill or are incinerated. This is not good for the environment. But many products could be designed to be reused or recycled or become the raw materials for other products.

Big companies look virtuous when they say they make products from plastic recovered from the oceans. Another reason to buy, say, Adidas shoes or Coca-Cola in recycled bottles. Our reporter has found that it is not what it seems to be.

Can we beam ourselves across the world with zero emissions? Physicists have now devised a kind of teleportation involving a phenomenon that Einstein called "spooky action at a distance.” However, Mr Spock would still need a rocket.

A growing number of nations are out to 'conquer' planets, claim their resources and profit from tourism. But is it legal? Can one country take over a planet? Who owns outer space?

Traffic jams cost us time and money. Ant highways are also super-busy – but clearly run a lot smoother. Those insect insights could be translated into better traffic conditions in the human world.

Berlin’s population grows by about 20,000 a year. Forecasts say the city will be home to 4 million people by 2030.  Its streets are increasingly busy as cars, cyclists and pedestrians vie for space. We talk to experts about sustainable solutions.