North American cities commit to tackle climate change in spite of the Trump administration.
Obama is expected to attend a gathering of mayors from around the globe convening in Chicago to discuss climate change after President Donald Trump said the US will pull out of the Paris climate accord.
Mayors from several USA cities are expected to sign a promise to reduce greenhouse emissions on Tuesday.
Obama harshly criticized his successor for exiting the 195-nation agreement at the time.
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As he discussed the Paris agreement to limit carbon emissions, which Trump pulled the USA out of, Obama got in another dig, saying "we have a little bit of a pause in American leadership". "We lead respectively where there is no consensus or directive out of our national governments".
Paris Mayor Anne Hidalgo said city residents will be victims as a result.
Emanuel and other Democratic mayors are forging their own policies on climate in the wake of the Trump Administration pulling out of the Paris Agreement to cut greenhouse emissions.
He says 51 mayors will sign a charter and discuss solutions including expanding access to public transportation.
Emanuel said Trump and his environmental officials are in denial on climate change.