Dozens of mayors from around the world have signed a "Chicago Climate Charter.” The summit was designed to address concerns following President Donald Trump's rejection of the Paris climate accord.
Former President Barack Obama was expected to address the crowd this/afternoon (Tuesday), following sessions on transportation, energy and waste management for mayors from cities including Paris, Mexico City, San Francisco and Phoenix.
Chicago Mayor Rahm Emanuel says climate change can be solved by human action.
The charter calls for mayors to achieve a percent reduction in greenhouse gas emissions that's equal or more than outlined in the Paris agreement. It also calls for them to work with scientific and academic experts to find solutions.
Some mayors have specifically agreed to commitments to expand public transportation and invest in natural climate solutions such as tree canopy and vegetation.