Thinktank says solar has been fastest-growing energy source for last 20 years, but remains dwarfed by hydro power
The world used clean power sources to meet more than 40% of its electricity demand last year for the first time since the 1940s, figures show.
A report by the energy thinktank Ember said the milestone was powered by a boom in solar power capacity, which has doubled in the last three years.
