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Dozens of mayors from around the world demanded Tuesday that their national leaders take bold steps at the Paris climate talks later this year, saying that may be the last chance to keep the warming of the Earth at levels safe for humanity.


Some 60 mayors — including Minneapolis Mayor Betsy Hodges — 

selected because they support Pope Francis' environmental message

 gathered Tuesday 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.


The mayors are expected to sign a declaration later Tuesday that states that "human-induced climate change is a scientific reality and its effective control is a moral imperative for humanity," according to the final declaration seen by The Associated Press.


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."


De Blasio is a founding member of an alliance of cities around the world that have committed to reducing their emissions by 80 percent by 2050 or sooner. He said New York was taking an interim step, committing to reducing its emissions by 40 percent by 2030.


The climax of Tuesday'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. The Vatican conference is aimed at showing how both are related: The exploitation of the Earth and its most vulnerable people, with global warming often responsible for creating "environmental refugees" forced to flee homes because of drought or other climate-induced natural disasters.


"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.


And it says political leaders have a "special responsibility" at the Paris talks to approve a "bold climate agreement that confines global warming to a limit safe for humanity, while protecting the poor and the vulnerable from ongoing climate change that gravely endangers their lives."


Drawing rousing applause in one of the opening speeches, California Gov. Jerry Brown denounced global warming deniers who he said are "bamboozling" the public and politicians with false information to persuade them that the world isn't getting warmer.


Brown, a former Jesuit seminarian, urged the mayors to not be complacent in opposing climate deniers. California has enacted the toughest greenhouse gas emissions standards in North America.


"We have a very powerful opposition that, at least in my country, spends billions on trying to keep from office people such as yourselves and elect troglodytes and other deniers of the obvious science," he said.


Stockholm Mayor Karin Wanngaard said the Paris talks must take fossil fuels off the table and focus on other energy sources. Stockholm is one of the world's leaders in using renewable energy sources, with 75 percent of the city's public transport network runs on renewable energy. Wanngaard's goal is to make the Swedish capital fossil fuel-free by 2040.


"Climate negotiators must dare to push boundaries and exclude fossil fuels as an option and reward solutions that are long-term sustainable and renewable," she said.
Other mayors attending hail from Boston; Boulder, Colorado; Oslo, Norway; San Francisco and Vancouver. Experts have long said that cities are key to reducing global warming since urban areas account for nearly three-quarters of human emissions.


In addition to the climate declaration, mayors will be asked to sign a statement against human trafficking that was first penned by religious leaders at the Vatican last year.


The conference opened with two tearful testimonies by Mexican women who were trafficked for prostitution and forced labor.


"We are human beings," said Ana Laura Perez Jaimes, who told of the 600 scars across her body she suffered when forced to work as a slave.

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Minneapolis Mayor Betsy Hodges is among the more than 60 mayors in attendance at a conference on climate change and human trafficking.

World mayors at Vatican seek 'bold climate agreement'

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