These images show the varying levels of light pollution on Earth, as seen from space. Canadian scientist Felix Pharand-Deschênes created the images to highlight our waste of energy.
Across the African continent, internet penetration is low, computers are often too expensive to purchase, and online business transactions can be logistically complicated to execute. But the surge in mobile phone use - there are currently 695 million mobile phone subscribers in Africa - has given Africans a simple and pervasive means of sharing information and conducting business.