Some 550 million people in Africa live without electricity and power is critically short in many African countries. But with increasing droughts and climate uncertainty this is not the right time to rush into more big dams when there are so many other promising renewable energy alternatives, says Lori Pottinger
Parts of India are on track for severe water shortages, according to results from Nasa's gravity satellites.
The Grace mission discovered that in the country's north-west - including Delhi - the water table is falling by about 4cm (1.6 inches) per year.
Writing in the journal Nature, they say rainfall has not changed, and water use is too high, mainly for farming.