Mayors from around the world signed a voluntary pact Sunday in Mexico City to reduce greenhouse gas emissions at a meeting meant as a precursor to UN-sponsored climate talks in Cancun opening next week.
The gathering in one of the world's most polluted cities assembled thousands of local and regional leaders to discuss a wide range of economic and social issues, including climate change.
Participants from some 135 cities and urban areas -- including Buenos Aires, Bogota, Johannesburg, Los Angeles, Paris and Vancouver -- signed the pact which states their intention to adopt a slate of measures to stem climate change...
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