The tide of public opinion is turning on plastic.The image of a whale with plastic stuck in its mouth on the BBC nature documentary Blue Planet 2 woke people up across the world to the reality of plastic pollution in our oceans. Experts think that by 2050, there could be more plastic than fish in the sea. Communities across the globe are saying that something must be done.But does this change in public mood spell disaster for plastic? And if so, what would replace it? We go from Europe, to the US and Indonesia to examine the supply and demand of plastic. Presenter: Michael Blastland Producers: Josephine Casserly and John Murphy

“Humans are the only species that willingly deprive themselves from sleep”. Ever since fire was discovered, we have traded off sleep time for other activities - from creating stone tools to partying. As our technology progressed, the list of things to do rather than sleep just got longer. But with sleep deprivation now a growing health problem, could we be reaching our limits? Or is tiredness part of our condition? In this week’s programme, an evolutionary biologist, a historian and a neuroscientist give us their take on whether we are now any more tired than our ancestors. We hear what makes human sleep unique and how it has evolved in surprising ways. And finally we hear from a woman with a dream – that we may never have to sleep again. Presenter: James Fletcher Producer: Estelle Doyle and Sarah Shebbeare This programme was first broadcast in July 2017.(Photo: A woman shows signs of tiredness as she counts ballot cards. Credit: Leon Neal/Getty Images)

From courtrooms and prisons to rehab centres and martial arts training. We look to Europe, Iraq, Central Asia and Saudi Arabia to investigate how they are dealing with Islamic State militants.The defeat of Islamic State in Iraq and Syria has raised a new, global challenge. While Iraq is funnelling huge numbers of Islamic State suspects through its courts, thousands of foreign fighters are returning to their home countries. What is happening to former IS fighters?(Photo: A man takes down a poster of the IS militant group's flag. Credit: Getty Images)

It is one of the largest, most profitable companies in the world, with billions of users, but more and more questions are being asked of Facebook. Accused of allowing the spread of fake news and hate speech, and of turning a blind eye to election meddling by Russia, Facebook is in the spotlight for the wrong reasons. Facebook’s founder and CEO, Mark Zuckerberg has committed himself to “fixing Facebook.” With the help of experts in the field, in the US, India and Germany, we ask if Facebook really is in trouble.Presenter: Helena Merriman Producers: John Murphy and Josephine Casserly(Photo: Indian demonstrators protest against Facebook's Free Basics initiative in Bangalore on 2 January, 2016. Credit: Manjunath Kiran/Getty Images)

The US and UK governments have accused Russia of orchestrating the most damaging cyber-attack in history. It caused billions of dollars’ worth of damage in over 60 countries. This programme tells the story of the attack as it unfolded across the globe. With the help of the world’s leading cyber security experts we take a forensic look at how the attack began, the extraordinary way in which it spread, and examine the international repercussions.(A laptop displays a message after being infected by a ransomware as part of a worldwide cyberattack. Photo Credit: Rob Engelaar/Getty Images)

Women earn less than men in every country in the world. Women are now more educated than ever before. But, on average, they don't take home the same in their pay packets. And laws against discrimination in the workplace haven't been enough to close the gap. This inequality in wages has proven difficult to shift. Governments, employers and unions are struggling to find solutions to this stubborn and deep-rooted problem. How do you close the gender pay gap? Presenter: Krupa Padhy Producers: Josephine Casserly and Nicola Kelly(image: Women from Dawson Street Child Care take part in a protest march as part of a campaign for equal pay in Melbourne, Australia. Credit: Scott Barbour/Getty Images)

It is feared than in a few months’ time Cape Town could run out of water. The city is planning for so-called Day Zero when the supply is switched off and people will have to collect water rations. Cape Town is an extreme example of what is now a global phenomenon of water scarcity. We investigate how the city got so close to the brink, and whether there’s anything that other cities around the world can do to avoid a similar fate.(image: A man collects drinking water from taps that are fed by a spring in Newlands,Cape Town at the foot of Table Mountain. Photo credit: Rodger Bosch/Getty Images.)

The Taliban have staged devastating attacks in the capital of Afghanistan, Kabul, in recent weeks. And a BBC study has discovered the group is active across the majority of the country – pushing beyond its traditional southern stronghold into eastern, western and northern parts. Seventeen years after the Taliban were toppled by a US-led invasion, it is clear the insurgent group has not been defeated. Why are the Taliban so resilient?Presenter: Helena Merriman Producers: Ruth Alexander and Josephine Casserly

The story of how the search for a material to replace ivory changed our lives forever. In the 19th century a billiard ball company placed an advert in a newspaper offering $10,000 to anyone who could come up with a substitute for ivory. There was growing concern that companies were hunting elephants into extinction so they could use their ivory for billiard balls, buttons and umbrella handles. The story that follows takes us from explosive factories that often went up in smoke to the modern world we find ourselves in today. How did plastics go from being a saviour of the environment to a cause for concern? How did we get hooked on plastic? Presenter: Helena Merriman Producer: Phoebe KeanePhoto: A man checks used plastic bottles for recycling at a recycling station in Agartala Credit: ARINDAM DEY/AFP/Getty Images

China has long been keen to assert its authority in the South China Sea. In recent years, it has undertaken a huge programme of island-building to stake its claim to the region. Fiery Cross, once a tiny reef, is now a fortified airbase. And this is just one of China’s seven artificial islands in the Sea.But China is not the only one. Bordered by seven states, many others also claim parts of the South China Sea as their own. Experts warn these hotly contested waters could be a flashpoint for conflict in 2018.Why is the South China Sea so important to China? (Photo: Fiery Cross. Credit: CSIS Asia Maritime Transparency Initiative/DigitalGlobe)