December 12, 2018: Hour 1

The Los Angeles City Council has approved new rules for Airbnb rentals in the city. Also, in November, scientists and diplomats voted unanimously to redefine the kilogram: It will no longer be based on a physical piece of metal, but on a math problem. And persistent warming in the Arctic has resulted in the "most unprecedented transition in history," according to a new report. That and more, in hour one of Here & Now's Dec. 12, 2018 full broadcast. You can read and hear more at hereandnow.org, follow us on Twitter and join the conversation on Facebook.