As Accra’s swelling population outgrows its supply of quality water, 500ml plastic packets of water have become a wildly popular. They offer a middle ground between pricey bottled water and suspect tap supply, but a patchwork of producers and lack of regulation raises…

India’s Bellandur Lake in Bengaluru is prone to bursting into flames, while a detergent-like foam sometimes tops the Yamuna river flowing through New Delhi.