It’s winter in Siberia – what a shocker! – but unlike in other parts of the world, global warming doesn’t seem to have a valid visa for Russia, and the temperatures have dropped abruptly in the city ...

For several months now, Suzanne Noubissie, a housewife in Douala, Cameroon's economic capital, has been swapping her coal-burning stove for one that uses a recycled oil. The device, designed by a ...