Cities must take lead role in tackling climate change, says Mexico City mayor

Ahead of the Paris climate talks, Mancera says countries should change direction and look to cities for inspiration - while revealing plans for a new water fund to address his city's major shortages

Once notorious for air pollution, Mexico City's ability to clean its skies has shown it can also be a leader in reducing emissions of greenhouse gases, according to the city's mayor, Miguel Angel Mancera.

Speaking at the signing of a new pledge to commit the equivalent of 10% of the city's discretionary budget to "defined resilience goals" - many of which are environment-related - Mancera stressed the role that megacities will have to play in tackling global warming.