Leaders of more than 160 countries are expected to sign the Paris Agreement on climate change Friday, a deal that once seemed unlikely but now appears on track to enter into force years ahead of schedule. The signing is happening on Earth Day.
Last fall, Here & Now's Jeremy Hobson spoke with former New York Mayor Michael Bloomberg and Vancouver Mayor Gregor Robertson. Both say cities can do more to combat climate change.
This segment aired on April 22, 2016.