CHICAGO - Dozens of mayors from around the world signed a "Chicago Climate Charter" on Tuesday at a summit created to address concerns following President Donald Trump's rejection of the Paris climate accord.
Former President Obama is in Chicago addressing mayors on climate change, after President Trump made a decision to withdraw the US from the agreement.
"President Obama will drop by the North American Climate Summit in Chicago this afternoon, where he will give brief remarks to thank the leaders gathered at the summit for their ongoing work to combat climate change", read a statement from Obama's spokeswoman.
Obama mentioned climate change during his evening speech organized by a club for leaders from the internet and communications industries was on the theme, "Fear Less, Innovate More".
Other mayors expected to attend include Ed Lee of San Francisco, Valerie Plante of Montreal and Miguel Angel Mancera of Mexico City.
Obama harshly criticized his successor for exiting the 195-nation agreement at the time.
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He explained mayors are stepping up because there's no consensus from national governments.
"We can not afford to be cautious", she said.
Trump further argued if the Paris agreement were completely implemented by all countries, "14 days of carbon emissions from China alone would wipe out the gains from America".
He says 51 mayors will sign a charter and discuss solutions including expanding access to public transportation.
Chicago's Chief Sustainability Officer Chris Wheat said the plan is to "fill the void" the Trump administration has left.