What You Need to Know About Lieberman Warner

The Lieberman-Warner Climate Security Act (CSA) hits the Senate floor for debate this week. Grist's Kate Sheppard has a great primer here.

The Lieberman-Warner Climate Security Act (CSA) hits the Senate floor for debate this week. Grist’s Kate Sheppard has a great primer here.

Chris Hayes TwitterChris Hayes is the Editor-at-Large of The Nation and host of “All In with Chris Hayes” on MSNBC.