California Gov. Jerry Brown is racing to persuade lawmakers to extend his state's signature program to confront climate change.
The cap-and-trade program has been closely watched around the world as a market-based way to reduce greenhouse gas emissions, but it expires in 2020.
It has implications far beyond the borders of the most populous U.S. state, which eagerly pushes the boundaries on environmental regulations and is looking to create a framework for climate policies that other states, provinces and countries can adopt.
The state Assembly and Senate are scheduled to take up the legislation Monday.
Here's a look at how the cap-and-trade policy works, what...