Mayors from across the country say a lack of leadership in Washington on climate change is prompting them to take action themselves.
"[The] good news is the Paris agreement - it was never going to solve the climate crisis on its own", he said, adding it was going to be "up to all of us".
"Thanks, Obama", he said, as the audience burst into laughter and applause.
Former New York Mayor Michael Bloomberg said that with or without USA participation, the world will continue moving forward towards the Paris goals.
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Obama talked about the lack of US leadership on climate issues in Paris on Saturday.
The former president cited a string of recent hurricanes that slammed Puerto Rico, Florida and Texas, noting that "more than two months later they are still struggling to recover".
Earlier this year, Trump declared that the US would no longer be a part of the landmark 2015 accord with 196 countries, claiming the non-binding agreement imposed unfair standards on American businesses and workers. He only said that the current administration's decision was "difficult to defend".
Valérie Plante, together with mayors from across North America, is setting climate change goals in accordance with the Paris Climate Agreement.
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The agreement requires the cities to track and publicly report city emissions, advocate for greater local authority and flexibility to take aggressive action on climate, and incorporate the realities of climate change and its impacts into local infrastructure and energy planning.
Former President Barack Obama has lamented the lack of United States leadership in the fight against climate change and without mentioning his successor Donald Trump, who has been dismantling his administration's environmental policies, he said that the country is in a position that is "difficult to defend". "We're on that path and we know our American sisters and brothers are".
Obama's former White House chief of staff - and more than 50 other mayors signed a "climate charter". "As it relates to climate change, we can't afford, as leaders of our respective cities, the absence of leadership and the wrongheadedness of policy by President Trump". Trump has said the terms of the agreement should be more favourable to businesses and taxpayers. "I applaud Mayor Barrett for taking aggressive steps to bring down carbon emissions levels".
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