Air is all around us. It's invisible and most of the time we don't think much about it. But when the air is polluted, it's deadly. Even when it doesn't kill us, polluted air increases respiratory illnesses, strokes, and Alzheimers; it may even be making us dumb. Air pollution is behind the deaths of at least 4.5million people a year worldwide, the vast majority harmed by tiny particles of soot emitted by burning fossil fuels in cars and factories or by burning wood or coal for cooking. So what can we do? Ritula Shah talks to health and public policy experts about the risks posed by polluted air. How can we clean up our air to have healthier bodies and brains and build better communities?

Twenty years after the signing of The Good Friday Agreement that brought peace to Northern Ireland, Brexit has unleashed new uncertainty about the island's future. In 2016 the UK voted to leave the European Union but Northern Ireland voted to remain. Irish nationalists in the north are unhappy about the possibility that controls on the land border with the Republic of Ireland could return. Supporters of a united Ireland have seized on this to argue that by joining the Republic, Northern Ireland would be able to get back into the EU. The Good Friday Agreement includes a provision for a referendum on unification known as a border poll. Whether nationalists could win is unclear but a mixture of worries about Brexit and demographic change suggest a future border poll would be much tighter than would have been the case ten years ago. Ritula Shah and a panel of experts discuss whether Brexit has opened the door to a united Ireland.

(Photo: Farmer standing on the border separating Northern Ireland and the Republic of Ireland. Credit: Charles McQuillan/Getty Images)

Ten years ago the US investment bank Lehman Brothers collapsed. The event rocked global stock markets and led to the biggest financial crash since the Great Depression. The decade that followed has been extraordinary. We've seen anger and discontent as living standards have fallen in large parts of the developed world. There's been political upheaval with the election of Donald Trump and the UK's vote for Brexit, while populists and demagogues have gained power across Europe. Ritula Shah and a panel of experts discuss the consequences of the 2008 financial crisis: low growth, a fragile global economy and a transformed political landscape. And, in the event of another crash, would governments have the ideas, the resources, and the goodwill to pull the global economy back from the brink?

For years Sweden has been praised for its generous welfare state and the welcoming hand it held out to refugees. But things are changing. Sweden is approaching the end of its most closely fought election in decades. Polls predict that the long dominant Social Democrats will get the largest share of the vote but not enough to govern alone. As in other European countries, significant numbers of the old working class are turning to an anti-EU anti-immigrant party. The Sweden Democrats are socially conservative, talking tough on immigration, and helped by recent criminal incidents that some are pinning on immigrants. They could get enough support to influence the country's future. President Trump has long been tweeting about Sweden, claiming "large scale immigration" there isn't working. But what's the evidence? Is Sweden suffering from an epidemic of crime caused by immigrants? Has it failed to assimilate the people it welcomed in? Or are these at best half-truths deployed in a tough election campaign? Ritula Shah and a panel of experts discuss whether Sweden has turned its back on its social democratic past?

Nearly 25 years on from independence the vast majority of South Africa’s farmland is still owned by the country’s white minority. But now the governing ANC is coming under pressure to change that. In the past the government has tried to find “willing sellers” but that’s only led to the redistribution of 10% of farmland. Now the government is considering more controversial moves. President Cyril Ramaphosa his indicated he would introduce a change to the constitution to allow, if necessary, land expropriation without compensation. White farmers are furious. Investors are worried too. They look at what has happened in neighbouring Zimbabwe where land seizures turned what was the breadbasket of Africa into an agricultural basket case. President Trump, too, has got involved, tweeting that he asked Secretary of State Mike Pompeo to look into “land and farm seizures” and "killing of farmers", prompting South Africa to accuse Mr Trump of stoking racial divisions. Paul Henley and a panel of expert guests discuss South Africa’s struggle with land reform.

LSD, magic mushrooms, mescaline, peyote - just some of the most well known psychedelic drugs. Most of them are illegal around the world. Research into psychedelic medicine was virtually shut down in the West because psychedelics were considered mind-altering substances open to abuse. This perception is changing. There is a growing body of evidence that some psychedelic drugs can be used to treat a variety of medical conditions. There have been clinical trials of psilocybin - the active ingredient in magic mushrooms - for treatment-resistant depression. Just one dose was found to help people with life-threatening cancer face death. James Coomarasamy and a panel of expert guests discuss the evidence that psychedelics have transformative and beneficial properties. Are most authorities right to continue to ban them or should they be considered for wider use - and if so, under what conditions?

People around the world continue to want a nation to call their own. There have been recent independence referendums in Kurdistan, Catalonia and Scotland. This trend has being going on for a century, as empires have given way to nation states, and those states have further subdivided. For much of the 20th century this made sense. Politics, the economy, and communications were mostly organised at a national scale. National governments had actual powers to manage modern economies. But after many decades of globalisation, have economies and information grown beyond the authority of national governments? How good are nation states at dealing with trans-national threats such as terrorism, migration or global warming? Carrie Gracie and a panel of expert guests discuss whether the nation state is in decline. And if so, what might replace it?

In many parts of the world this has been a season of extreme heat. Records have been broken from North America to Europe, from the Middle East to Japan and Korea. We know the climate is changing, and that many of the reasons are man-made. International commitments to limit the average rise in global temperature - to less than two degrees above pre-industrial levels - demand concerted action around the world. Chris Morris and a panel of expert guests discuss the science behind extreme heat. What are the political solutions and the new technologies that may be able to help us? And even if we can mitigate against extreme temperatures, are heatwaves going to become the new normal?

(Photo: Cameroonian Girl sweating and drinking water from a green jerry can. Credit: Getty Images)

It has been over seven years since the uprising in Syria turned first into a civil war and then into a proxy war that has drawn in countries near and far. During that time at least 350,000 people have been killed, over 5 million have fled the country, and over 6 million have lost their homes. The war has seen sieges, artillery barrages and airstrikes on civilian neighbourhoods, hospitals and schools. With the help of Iran, Russia and Hezbollah, the Syrian president, Bashar al-Assad has recaptured the major cities. His enemies are, as ever, divided. Rebels cling on to enclaves near the Turkish border in the north and in the north-east the Kurdish dominated SDF still controls about a quarter of the country. But in the south, the Syrian government has this week retaken Deraa province where the uprising began in 2011. So is the war coming to an end? Or is it entering a new phase? This week on The Real Story Chris Morris and a panel of expert guests discuss the Syrian war, how long does it have to go and how can the country start to rebuild?

(Photo: A house burns after Syrian forces shelled it with heavy artillery in the besieged town of Douma by Muhammad Al-Najjar/SOPA Images/LightRocket via Getty Images)

On Monday Zimbabwe will hold elections - the first to take place since former President Robert Mugabe was forced to stand down by the military after nearly 40 years in office. Under his rule the southern African country went from being one of the brightest economies in the region to one of the weakest. Opposition parties were repeatedly frustrated at the polls with violence and intimidation. The country is currently being led by former minister Emmerson Mnangagwa, nicknamed "the crocodile", who is leading public opinion polls. Julian Marshall is joined by government, opposition and expert guests to discuss whether these elections represent a clean break with the Mugabe years and what it will now take for Zimbabwe to attract the investment needed for stability, prosperity, and jobs.

(Photo: A man wears a Zimbabwean flag after a rally by Movement for Democratic Change leader and opposition presidential candidate, Nelson Chamisa. Credit: Dan Kitwood/Getty Images)