Germany's energy shift from nuclear to renewables is costly and complicated. The move was inspired by the nuclear disaster in Japan - and it is the Japanese who are inventing some of the solutions.
Cities hold tons of materials that can be reused — and doing so can address over-exploitation of scarce natural resources. From buildings to electronic waste, we are surrounded by value. So how does urban mining work?
Lithium ion battery packs are small and light and of the highest quality available, so they're popular with the electronics industry. But the Samsung Note 7 disaster raises questions: how risky are they?
The development of renewable energy is setting new records, with solar power now becoming cheaper than energy from new coal or nuclear plants. China and other players in Asia are making serious inroads into the market.
Whether in cars, laptops or smartphones, cobalt is in nearly all batteries. The biggest supplier is the Democratic Republic of Congo, where human rights are often violated in the mines.
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