In much of Africa, drinking water is too high in fluoride, which can damage teeth and joints. A German project to install a solar-powered filter system in a Ghanain village is tackling the problem.
Electricity is rare in the remote Kalunga villages, but diesel and kerosene lamps are dangerous. Could solar power from plastic bottles be the answer?
Nairobi's reliance on motorcycles is hindering efforts to reduce carbon emissions, as manufacturers struggle to adapt to clean energy technology. But a new solar-powered three-wheeler could help clean up the city's act.
With polluted air and a coal-hungry economy, India is using the UN climate conference to show the world it can continue rapid development without fossil fuels. But the South Asian country still runs on dirty energy.
Germans broke new ground in 2018 by receiving more electricity from "green" energy sources than from coal power plants, a new study said. But experts warn that Berlin could still miss its energy goals for 2030.
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