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Thousands of U.S. troops are getting discharged out of the army. Many suffer from post traumatic stress disorders and brain injuries, and aren't getting the care they need. The Army claims these discharged soldiers have pre-existing mental illnesses or are guilty of misconduct. But health advocates say these are wrongful discharges, a way for the army to get rid of "problem" soldiers quickly, without giving them the treatment to which they're entitled.NOW covered this issue last summer, and this week we revisit the army's controversial position and follow up with affected soldiers we met. As a result of the media attention from our report and others, the Department of Defense revised its criteria for diagnosing pre-existing conditions and, now, fewer soldiers are receiving the diagnosis, making more of them eligible for care.Also on the show, we update how the distant Pacific nation of Kiribati is dealing with the reality that both their land and culture could disappear from the Earth due to global warming. Kiribati President Anote Tong is now considering purchasing land abroad to save his people. He says his pleas for international support have largely fallen on deaf ears. Experts predict millions of people will become climate change refugees in the years to come.

One of the most controversial figures in the illegal immigration debate is Joe Arpaio, the longtime sheriff of Arizona's Maricopa County, whose aggressive hard line on local crime has received national attention. But has Sheriff Arpaio, who's made the most of federally-granted authority to enforce immigration laws, crossed the line when it comes to serving and protecting his community? Some critics have accused him of racial profiling. This week, NOW's colleagues at "Expose" and local reporters from the East Valley Tribune reveal what Sheriff Arpaio was -- and wasn't -- doing in the name of law enforcement. In a special bonus interview, NOW Senior Correspondent Maria Hinojosa sits down with Joe Arpaio for an intense discussion about the issues and criticism swirling around him.

On March 13, financial ministers and central bankers of the world's economic superpowers will meet in London to lay the groundwork for next month's crucial meeting of their country's leaders, known as the G20. Will their work revolutionize the global economy and lift us out of this economic hole, or will politics get in the way? David Brancaccio interviews Kenneth Rogoff, Harvard economics professor and former chief economist of the International Monetary Fund, about how high we should raise our hopes and what's at stake for America and the world.

How could a struggle over land lead to the brutal murder of an American nun? David Brancaccio interviews award-winning filmmaker Daniel Junge on his latest film "They Killed Sister Dorothy." The documentary focuses on Sister Dorothy Stang, a Catholic nun from Dayton, Ohio, who in 2005 was killed on a muddy road in the Brazilian Amazon she worked tirelessly to save. But it's also the story of peasant farmers hoping to preserve their way of life in the face of powerful industry interests. Who will dare stand up in the battle between the haves and the have nots, and will our world's ecosystem pay the biggest price? "Peasant people... don't have a chance to share in the riches that the planet can offer because some people are taking off so much of the pleasures of this world, and there's only so much to go around," Sister Dorothy said before her death.

Americans have a longstanding love affair with food -- the modern supermarket has, on average, 47,000 products. But do we really know what goes into making the products we so eagerly consume? David Brancaccio talks with filmmaker Robert Kenner, the director of Food, Inc., which takes a hard look at the secretive and surprising journey food takes on the way from processing plants to our dinner tables. The two discuss why contemporary food processing secrets are so closely guarded, their impact on our health, and another surprising fact: how consumers are actually empowered to make a difference.

In this struggling economy, boomers are rightfully worried about the funds they were counting on to carry them through the rest of their lives. Will they be able to afford their own retirement? NOW turns to two experts for help and insight: Amy Domini, a pioneer in the field of socially responsible investing; and journalist Dan Gross, who covers the economy for Slate and Newsweek.

A shocking statistic -- teenagers are in more danger from sexual predators at their part time jobs than through the Internet. It's a vastly underreported phenomenon, but some brave young women are stepping up publicly to tell their stories. NOW collaborates with the Schuster Institute for Investigative Journalism at Brandeis University to bring you an unprecedented broadcast investigation of teen sexual harassment in the workplace. In the program, abused teenagers share their own stories with senior correspondent Maria Hinojosa. We track their legal journeys to justice, and how the issue impacts hundreds of thousands of teenagers across the country -- many of whom don't know how to report workplace abuse, or to even recognize when their bosses cross the line.

President Obama's stimulus money is nearly out the door and on its way to the states, but will it be spent in the way it is intended? One alarming example: Mass transit. Cities and states, strapped for money, are cutting back on mass transit even as it becomes more popular with Americans. Meanwhile, President Obama is calling for increased mass transit as a necessary step toward energy independence. Will the government's investment dramatically revitalize our national travel infrastructure, or will states spend the money according to 'business as usual'? NOW travels to North Carolina to see what the future holds for mass transit in these troubling financial times. Our investigation is part of a PBS-wide series on the country's infrastructure called "Blueprint America."

Across the country, cities are in crisis because of the fallout from the mortgage mess--property taxes are way down, and abandoned homes are bringing down property values, inviting crime, and draining government coffers. Neighborhoods are being destroyed. Yet the federal bailout money is not going directly to desperate communities and homeowners, but to local and national banks. NOW investigates the innovative way some cities are fighting back. The city of Memphis, Tennessee is suing major national lenders and banks for deceptive and discriminatory lending practices in an effort to recoup the cost of the financial mess. Other cities using this legal tactic include Baltimore, Cleveland, Buffalo, Birmingham, and San Diego. With desperation climbing alongside debt, can the strategy help these blighted parts of America?

With this week's swearing-in of Treasury Secretary Tim Geithner, President Obama's economic team is finally ready to tackle the massive challenge before them. One big question: how much control will they wield over America's banks, the first recipients of the federal bailout? David Brancaccio sits down with financial reporter Bethany McLean -- who broke the Enron story -- to look at options on the table for stabilizing the country's financial system. If banks are nationalized, it will have an enormous impact on depositors, shareholders and taxpayers. Everyone agrees that our banks need federal money to avoid even more calamity, but how much is too much, and who's watching how they spend it?

The economic crisis is affecting people in all income and social brackets, but America's baby boomers and seniors don't have the option to wait it out. The housing meltdown, market crash, and rising costs of everything from food to medicine have taken the luster out of seniors' "golden years" or worse, put them into deep debt. Some are reluctantly exiting retirement to look for jobs, while others are falling prey to predatory lending companies. NOW travels to South Carolina, a state where many retirees and winter refugees are being forced to rewrite the last chapter in their lives, to see how they are coping and what options are left.

As America looks to dramatically increase its use of renewable energy, an inconvenient reality stands in the way: the need to upgrade the country's antiquated electricity grid. Part of that overhaul involves the construction of gigantic and expensive long-distance transmission lines to carry clean energy from remote sites to population centers. NOW travels to California, which has the most ambitious clean energy plan in the nation. But the state's efforts face stiff opposition from property owners and conservationists who prefer renewable energy from "local sources," such as photovoltaic rooftop solar panels. Complicating the matter are claims that the transmission lines are not actually carrying renewable energy at all, but represent a thinly-disguised strategy to stick to old energy practices.

A rise in sea levels isn't the only impact global warming is having on the world's oceans. A growing body of evidence suggests that climate change is also affecting ocean currents and the chemistry of the seas, with potentially catastrophic results on the way we live. NOW travels deep into our oceans with scientists from the Woods Hole Oceanographic Institution and help from other researchers for a first hand look at this stunning sea change, and what we can do about it.

With the economy in a downward spiral, more and more people are taking advantage of credit card offers to make ends meet, but are the credit card companies really taking advantage of their customers? NOW meets with families struggling to pay off the credit card debt they've accumulated -- a debt made even larger thanks to questionable industry practices like doubling and tripling interest rates without warning, increasing fees and penalties, and shrinking credit limits. We take a hard look at the small print in credit card offers, and at Congressional legislation aiming to regulate the industry. Are you getting the credit you deserve?

Unable to make ends meet, many families in western Nepal have been forced to sell their daughters, some as young as six, to work far from home as bonded servants in private homes. With living conditions entirely at the discretion of their employers, these girls seldom attend school and are sometimes forced into prostitution. NOW travels to Nepal during the Maghe Sankranti holiday, when labor contractors come to the villages of the area to "buy" the children. There, we meet the Nepalese Youth Opportunity Foundation, which is trying to break the cycle of poverty and pain with an Enterprising Idea. They're providing desperate families with an incentive to keep their daughters: a piglet or a goat that can ultimately be sold for a sum equivalent to that of their child's labor. The organization says it has brought thousands of girls home to live with their families, but many cultural and political challenges still stand in their way.