Combatting the climate crisis will require enormous individual change as well as drastic changes to our global economic model. When Paul Polman was CEO of consumer goods giant Unilever, he was one of the first titans of commerce to recognize the environmental issue. He joins the program to discuss the role of businesses in climate change.

Environmentalist Bill McKibben was one of the first to sound the alarm about climate change. His message to the public is simple: We have already done lasting damage to the planet, and we need to take urgent action before the situation becomes irretrievable. He joins the program to explain how divestment efforts are affecting the fossil fuel industry.

Raul Ortiz joined the U.S. Border Patrol in 1991, and later served in Afghanistan. Now - thanks to President Trump -- he's the Border Patrol's new Deputy Chief. Over his career, he's been responsible for Border Patrol operations in 41 Texas counties and has witnessed families being torn apart at the border. He sits down with Walter to discuss this and President Trump's immigration policy.

The coronavirus has killed more than 3,000 people and that number is rising rapidly. The World Health Organization has raised its risk assessment to "Very High" as a reality check and warning to every government in the world to contain the spread. Dr. Paul Offit, a Professor of Vaccinology at the University of Pennsylvania, breaks down the dangers of the virus.

Joe Biden has gained serious momentum heading into Super Tuesday. A comprehensive primary victory in South Carolina over the weekend coupled with the campaign suspensions of Pete Buttigieg and Amy Klobuchar may have wide implications as the centrists of the Democratic party coalesce around Biden’s candidacy. House Majority Whip Jim Clyburn joins the program to explain why he's endorsing Biden.

On Saturday, the U.S. signed a deal with the Taliban that it hopes will finally end America’s longest war, the conflict in Afghanistan. Next week, the Afghan government will finally start negotiating face to face with the Taliban. Adela Raz, Afghanistan's Ambassador to the U.N., joins Christiane to explain this complicated process.

After this weekend’s South Carolina primary, Super Tuesday will separate winners from losers in the Democratic presidential race. 14 states will go to the polls March 3rd, including delegate-rich California and Texas. Right now, all eyes are on Texas to see whether this red state will turn purple as demographics shift. Journalist Jeremy Wallace joins Walter to discuss this battleground state.

The new film "Greed" tells the story of a disgraced billionaire. It's a thinly disguised version of the story of the British fast fashion mogul Sir Philip Green. He's accused of exploiting cheap labor in the form of South Asian garment workers to rake in billions for himself. Comedian Steve Coogan and director Michael Winterbottom join the program to discuss the film and the fast fashion industry.

In December, Myanmar's leader Aung San Suu Kyi was called before the international court of justice in the Hague and accused of government-sponsored genocide against Rohingya Muslims -- charges she denied. Historian Thant Myint-U joins Christiane to discuss this fraught situation and his new book "The Hidden History of Burma."

Award-winning journalist Aaron Glantz's latest book, “Homewreckers,” takes a shocking new look at America’s 2008 housing crisis. It’s a tale of greed and corruption, as Glantz pulls back the curtain on a group of Wall Street magnates who he says took advantage of a rigged system. Moreover, as Glantz tells Hari Sreenivasan, these “homewreckers” include key members of President Trump’s inner circle.

For the first time ever, there are now more new infections of coronavirus outside mainland China--where it originated--than inside, where it originated, and the world is scrambling to contain it. Tom Frieden was director of the Centers for Disease Control during the Ebola crisis, and joins the show to explain the severity of the crisis and how the U.S. should respond.

In France, a shocking story has shattered the image of a man once called a “living saint.” Jean Vanier was revered for his devotion to the disabled, yet the organization he founded, L’Arche International, revealed this past week that Vanier sexually abused at least six women over a period of 30 years. His biographer Michael Higgins joins the program to react to this news.

Congressman Dan Crenshaw of Texas was a Navy SEAL in Afghanistan eight years ago when he sustained a shrapnel injury to his eye. Thus healthcare is high on his list of priorities, especially because he lost his mother to cancer. Walter Isaacson speaks with Crenshaw in his home state of Texas about these and other election issues on his radar, as he faces his fight for re-election this November.

In 1974, one young lawyer stood at the intersection of the Watergate scandal and the women’s movement. Jill Wine-Banks, then just thirty years old, was an assistant special prosecutor in the Watergate investigation, the only woman on a team that took down the highest ranking White House officials. She joins Christiane to discuss her new book "The Watergate Girl," which details this experience.

After being attacked from all sides at last night’s debate, Bernie Sanders is still standing and positioned as the strong frontrunner. But the criticisms came thick and fast from his fellow candidates, who slammed Sanders for his stance on guns and the price tag for his policies. His campaign co-chair Nina Turner joins the program to discuss whether the U.S. is ready for a Democratic socialist.

America Ferrera is the executive producer of the new Netflix show “Gentefied,” a bilingual drama following three Mexican-American cousins’ fight to keep their grandfather’s taco shop open. Ferrera herself is a first generation Latina whose parents immigrated from Honduras. She joins Michel Martin to discuss how her experiences shape the way she portrays the Latinx community.

Former mayor of Chicago Rahm Emanuel believes local politics determine the national. He has served in the White House under Presidents Clinton and Obama, in Congress, and now has a new book making the case for mayors: “The Nation City: Why Mayors Are Now Running the World.” He gives Christiane his opinions on two former mayors who are now running for president: Mike Bloomberg and Bernie Sanders.

President Trump’s official state visit to India has ended with a deal on defense cooperation, but the trip has also been marked by some of the deadliest clashes in India in decades. Tension has been building since the controversial citizenship law brought in by Prime Minister Narendra Modi, which discriminates against Muslims. Journalist Bobby Ghosh joins Christiane to discuss.

Dan Pfeiffer was once a senior advisor to President Obama. But it’s in the podcast world that he really found fame, as one of the co-hosts of “Pod Save America.” Now, he is warning that the very idea of American democracy is under threat. It’s a theme he explores in his new book, “Un-Trumping America.” He joins Michel to explain how he believes Democrats can win in November.

Douglas Wigdor represented one of the so-called “Molineux” witnesses at the Weinstein trial and was in the courtroom when the verdict was announced. He joins the program from outside the court to talk through how all this unfolded and what happens next.