ISLAMABAD - In a bid to freshen its air and cut planet-warming emissions, the Pakistani port city of Karachi will introduce cleaner-running buses powered by a decidedly "unclean" fuel: cow poo.

With funding from the international Green Climate Fund, Karachi will launch a zero-emission <link https: www.greenclimate.fund projects fp085 _blank>Green Bus Rapid Transit (BRT) network, with 200 buses fuelled by bio-methane.

Locals said the new bus system - due to start operating in 2020 - would help reduce air pollution and street noise, but doubted whether it would have enough buses to resurrect the city's ailing transport system.

"(Karachi's) public transport system has totally collapsed and most people have to use online taxi-hailing services (and) auto rickshaws," said commuter Afzal Ahmed, 45, who works as a medical sales representative.

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