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Sitting at the base of Islamabad’s Margalla Hills is the Raziuddin Siddiqi Memorial Library, a four-storey building packed with more than 2 million books, CDs and DVDs.  

Along with being one of Pakistan’s largest libraries, Raziuddin Siddiqi is unique for another reason: on entering the building one won’t hear the tell-tale flicker of fluorescent lights. 

A few dozen kilometres inland from northern Panama’s coast is the Hato Chami school.

Set amid winding roads, green trees and stunning mountains, it has more than 1,000 pupils, most of whom hail from one of Panama’s largest indigenous groups, the Ngäbe.

Rosa Cordero, who is diabetic, remembers a time when she couldn’t store her insulin safely. Her refrigerator was old and unreliable, and she never knew if the temperature was cool enough to store the drug.

How many people does it take to change a light bulb? So begins the old joke, but the more serious question for India’s Energy Efficiency Services Ltd was how many people need to switch to energy-efficient light bulbs in order to reduce the nation’s carbon footprint?