The above chart shows how the city plans to reduce its emissions by 62 percent by 2040. [City of Chicago]

Mayor Lori Lightfoot last month set an ambitious goal: to slash the city's carbon emissions by more than half in the next 18 years. But Chicago's track record of falling short on climate promises and the absence of built-in accountability systems has advocates calling for the city to do more.

Lightfoot last month unveiled a draft of the city’s new Climate Action Plan meant to guide the city in reducing emissions by 62 percent by 2040. The 87-page document, the city’s first updated climate plan since Mayor Richard M. Daley’s administration published the last one in 2008, plans to reduce emissions through strategies including retrofitting buildings, electrifying the city’s vehicle fleet, diverting waste through a long-promised compost program and expanding the city’s bike lane network.