Dr. Michael Mann, Earth System Science Center - Penn State University / The Hockey Stick and the Climate Wars joins Thom. March 2015...The Hottest Month Ever!

For tonight's Bigger Picture Panel - we're going to take a closer look at a conflict that has many experts talking about a regionwide Cold War in the Middle East. Since late March - Saudi Arabia and a group of other Sunni Arab nations have been waging an air war against the Houthis - a rebel group that has taken over large swaths of territory in Yemen - the Arab world's poorest country. Coming amid rising tensions between the Saudis and Iran - the geopolitical consequences of this conflict are huge. It's also a humanitarian disaster. So far - an estimated 731 people have been killed - more than 2,754 have been injured - and more than 150,000 have been displaced. So what are the root causes of the crisis in Yemen? How is it dividing an already war-torn region? And what should the global community do to resolve a conflict that's threatening the lives of millions? Let's ask two experts - Ali al-Ahmed - Expert on Saudi politics at the Institute for Gulf Affairs and Scott Paul - Senior Humanitarian Policy Adviser at Oxfam America.

America's Lawyer Mike Papantonio, Ring of Fire Radio joins Thom. The rig explosion killed 11 workers and injured 16 others and caused one of the largest oil spills in US history. According to estimates - nearly 5 million barrels of oil spilled into the Gulf - devastating the marine ecosystems there and doing unprecedented damage to the Gulf’s fishing and tourism industries. The oil spill contaminated over 1,100 miles of Gulf coastline and killed countless numbers of marine animals - from sea turtles to pelicans to shrimp. The Gulf fishing industry lost at least $247 million because of the spill - while tourism in the area took a hit to the tune of $22.7 billion between 2010 and 2013. Five years later - BP - the oil giant behind the spill - is working hard to pitch the notion that the Gulf is finally returning to normal.

For tonight's Bigger Picture Panel - we're going to take a closer look at a conflict that has many experts talking about a regionwide Cold War in the Middle East. Since late March - Saudi Arabia and a group of other Sunni Arab nations have been waging an air war against the Houthis - a rebel group that has taken over large swaths of territory in Yemen - the Arab world's poorest country. Coming amid rising tensions between the Saudis and Iran - the geopolitical consequences of this conflict are huge. It's also a humanitarian disaster. So far - an estimated 731 people have been killed - more than 2,754 have been injured - and more than 150,000 have been displaced. So what are the root causes of the crisis in Yemen? How is it dividing an already war-torn region? And what should the global community do to resolve a conflict that's threatening the lives of millions? Let's ask two experts - Ali al-Ahmed - Expert on Saudi politics at the Institute for Gulf Affairs and Scott Paul - Senior Humanitarian Policy Adviser at Oxfam America.

Kevin L. Kearns, United States Business & Industry Council (USBIC) joins thom. President Obama wants fast track trade authority and lawmakers in Congress - on both sides of the aisle - are trying to give it to him. Is the TPP a foregone conclusion now - or is there still time to stop this so-called free trade deal?

Tommy Christopher, The Daily Banter, joins Thom. When interviewed by MSNBC at the First in the Nation Summit this weekend, Scott Walker had a really bizarre response to a question about whether he would attend a gay wedding...

Aaron Houston, Pro-pot lobbyist, joins Thom. Today is 420 - a day where pot lovers across the country light up to honor their favorite greenery. But why has 420 become synonomous with marijuana in the first place? Tune in and find out.

And the Very Very Ugly. Michael Savage! During a recent episode of his radio program the right-wing talk show host blasted gay rights activists for writing an open letter to the Pope asking him to replace San Francisco Archbishop Salvatore Cordileone - He’s come under fire for making homophobic comments. According to Savage - who’s real name is Michael Weiner - the gay activists were acting like “Nazis.” Take a listen.

Thom discusses the five year anniversary of the disastrous BP oil spill with attorney and radio host Mike Papantonio, whether Loretta Lynch will ever be confirmed with The Daily Banter’s Tommy Christopher, and the origins of the 4/20 marijuana holiday with pro-pot lobbyist Aaron Houston. In tonight’s Daily Take Thom details how the war on drugs continues to destroy lives.

Tonight’s Big Picture Rumble discusses why Loretta Lynch hasn’t been confirmed, why Congress has given Obama fast-track authority on the TPP, and how Congress quietly passed a bill to give tax breaks to mega-donors like the Koch Brothers. Tonight’s Bigger Picture discussion looks at the crisis in Yemen with the Institute for Gulf Affair’s Ali al-Ahmed and Oxfam America’s Scott Paul.

Stephen Spaulding, Common Cause, joins thom Hartmann. Capitol lawn - lawmakers in one of the reddest of red states - Montana - passed a groundbreaking campaign finance law. The so-called Montana Disclose Act - which was supported by both Democrats AND Republicans - requires any group that spends money on Montana state elections to reveal where that money comes from. For once - this is some really good news...

Sheriff Richard Mack, The Constitutional Sheriffs & Peace Officers Association (CSPOA), joins Thom Hartmann. New reports suggest that Robert Bates - the volunteer Tulsa - Oklahoma police officer who's been charged with manslaughter for killing an unarmed black man - may not have had the proper training to be in the field. Is this true of other "pay to play" cops all across the country?

Stewart Acuff, Playing Bigger Than You Are, joins Thom. Hillary Clinton's 2016 campaign is now in full swing - and the former Secretary of State has spent most of the past week making overtures to the progressive wing of the Democratic Party. Will this new populist Hillary last? Or does she still need a challenger like Bernie Sanders to keep her honest?

David Laska, New York State Republican Party, joins Thom. A self-described Tea Party Patriot is taking the internet by storm - after saying that he might just have to vote for Hillary Clinton in 2016. Why's he saying that - and will more Conservatives be jumping the Republican ship soon too?

And the Very Very Ugly! Daniel Lapin! During an appearance on the Family Research Council’s Washington Watch radio show Tuesday - the far-right rabbi offered this theory as to why liberals supposedly “love” radical Islam. Take a listen...