Some 60 mayors selected because they support Pope Francis' environmental message gathered today at the Vatican for a two-day conference to keep the pressure on world leaders ahead of the Paris negotiations in December.
Francis last month released an environmental encyclical that denounced what he calls a fossil fuel-based world economy that exploits the poor and destroys the Earth.
In his remarks to the meeting, New York City Mayor Bill de Blasio announced new greenhouse gas emissions targets for the Big Apple and urged other cities to follow suit.
"The Paris summit is just months away," De Blasio said. "We need to see it as the finish line of a sprint, and take every local action we can in the coming months to maximize the chance that our national governments will act boldly."
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He said New York was taking an interim step, committing to reducing its emissions by 40 per cent by 2030.
The climax of today's inaugural session was an afternoon audience with Pope Francis, who has become a hero to the environmental movement and has used his moral authority and enormous popularity to focus world attention on climate change and its effects on the poor.
Francis' other main priority has been to raise awareness about human trafficking.
"Addressing both these phenomenon, climate change and modern slavery, is a herculean task for us as city administrators," said Tony Chammany, the mayor of Kochi, India.
The final declaration calls for financial incentives to transition from using fossil fuels to using low-carbon and renewable energies and to shift public financing away from the military to "urgent investments" in sustainable development, with wealthy countries helping poorer ones.