Mexico City, Tokyo and Shanghai — megacities with populations of more than 20 million people and with unique infrastructures — have in recent years all made pledges toward total sustainability. What can Los Angeles learn from their triumphs and struggles?

On Oct. 3, the Hammer Museum at UCLA is hosting a conversation in which participants will dig into that question. Matt Petersen, former chief sustainability officer of Los Angeles and chief executive officer of the Los Angeles Cleantech Incubator, joins Dana Cuff, UCLA professor of architecture and urban design and director of cityLAB, in a conversation moderated by Mark Gold, UCLA associate vice chancellor of environment and sustainability.

The discussion is the latest in the UCLA Sustainable LA Grand Challenge’s series, “Future L.A.: Engineering a Sustainable Supercity,” which is presented in partnership with the Hammer Museum. The series brings together community voices, experts and scholars in conversations on regional sustainability efforts and the critical role we all play in realizing this future.

The free talk will begin at 7:30 p.m. on Wednesday, Oct. 3, in the Billy Wilder Theater inside the Hammer Museum. Tickets are required and available at the museum box office one hour before the program.