Five scientists, working in different parts of the world, bear witness to some of the dramatic changes to our planet that have occurred in their lifetimes, as the global climate warms. They share their hopes and fears and report on some ingenious local solutions to rapidly changing conditions.

3. 3 million square kilometres of ice has been lost in the Arctic since 1979. Geographer, Professor Mary Edwards lived in Alaska for many years. She has witnessed a cruise ship navigating the Northwest Passage for the first time and seen villages in the Arctic disappear, as melting ice has led to a dramatic loss of landmass too.

Produced by Anna Buckley for the BBC Radio Science Unit.

First broadcast on Wednesday 23 May, 2018.

Five scientists, working in different parts of the world, bear witness to some of the dramatic changes to our planet that have occurred in their lifetimes, as the global climate warms.

Professor Sir John Lawton is an ecologist and Vice President of the RSPB. He has been bird-watching in the UK since he was a boy. He remembers bird populations that have now collapsed and has seen Mediterranean species that were once rare in the UK become commonplace: multiple canaries in the global climate coal-mine, he says.

Produced by Anna Buckley for the BBC Radio Science Unit.

First broadcast on Tuesday 22 May, 2018.

Five scientists, working in different parts of the world, bear witness to some of the dramatic changes to our planet that have occurred in their lifetimes, as the global climate warms. 1. Marine biologist and underwater diver, Professor Callum Roberts of the University of York, has seen coral reefs that were once multi-coloured and teeming with life reduced to grey, lifeless underwater landscapes with devastating consequences for marine bio-diversity. Just 0.1% of the ocean life is coral reefs but they support more than a quarter of all the species that live in the sea.

Produced by Anna Buckley for the BBC Radio Science Unit.

First broadcast on Monday 21 May, 2018.

The solutions to the problem of plastic pollution and plastic waste lie in many directions. A global plan to stop littering will go a long way. But human behaviour change often needs some economic intervention. One idea by the UK government and many others around the world, is to give a little financial incentive in the form of deposits on plastic bottles, or taxation on single use plastic like coffee cups, food wrapping and plastic bags. Mark Miodownik investigates some of the scientific solutions such as alternatives to petrochemical plastic using microbes or plant materials, clever waste sorting technologies to help make the process easier, even using less plastic. And he hopefully untangles some of the confusing messages about plastic and comes up with ways to be plastic smart.

Producer: Fiona Roberts

First broadcast on Tuesday 29 May, 2018.

Plastic waste has been a global crisis waiting to happen. To date it's estimated that around 8.3 billion tonnes of waste plastic exists. That's 25 Empire State Buildings or 1 billion elephants. Incredibly around half of this has been generated in just the last 14 years, despite mass production having begun in the 1950s. Events such as China's recent refusal to take any more "foreign rubbish" and Sir David Attenborough's graphic portrayal of the devastation that plastic waste is causing in our oceans, has prompted political and media discussion like never before. We are at a critical moment where, if we're to turn the tide on plastic pollution, it will require science and society to come together to create real change. But it won't be easy. One major area that needs an overhaul is recycling. In the UK only 14% of plastic collected is recycled. We, and the rest of Europe tend to burn our waste for energy, and plastic has a calorific value similar to that of coal. But proponents of the circular economy say we should never consider plastic as waste at all and we should think of it as 'Buried Sunshine' - a resource that needs conserving - by reusing and recycling again and again.

Producer: Fiona Roberts

First broadcast on Tuesday 22 May, 2018.

Plastic waste and pollution have become a global problem but is there any sign of a global solution? And how did we allow this to happen in the first place? Across three programmes, materials scientist and broadcaster, Professor Mark Miodownik, explores how we fell in love with plastic, why we've ended up with oceans of waste blighting the environment and what science and society can do about it.

Programme 1 - First Flush of Love

We may not be on speaking terms right now. But we do have a love affair with plastic, in fact it can be all consuming. Adaptable, lightweight, cheap and hygienic - fantastic plastics started to win our affection back in the late 19th century. Bakelite was an early plastic invented to replace expensive wood. Celluloid was one of the earliest plastics, failing to replace ivory in billiard balls, but revolutionising the world as movie film. Plastic really did change our world. Plastic radar insulation played a role in helping the Allied forces win the Second World War and after the conflict, factories start to churn out cheap, mass-produced goods in the new synthetic polymers. But some of the key virtues of plastic may now have paradoxically poisoned the relationship. Being virtually indestructible, has led to a build-up of toxic micro-plastic in the oceans and environment. We've grown to regard many plastics as cheap and disposable, we take it for granted, rely on it too much, value it too little and are too ready to cast it aside after one single use.

Producer: Fiona Roberts

First broadcast on Tuesday 15 May, 2018.

Addiction specialist Sally Marlow examines the science behind addiction to find out why so many people in Britain are hooked on drugs and alcohol.

Neuroscientists now have a sophisticated understanding of the networks in the brain that can pull a person towards addiction and hold them there. Changes in the brain also help to explain why it can be so incredibly hard to quit. But brains don't act in isolation, and neuroscience doesn't explain everything.

Why do some people get hooked in the first place while others, who use drugs recreationally, do not? How much of addiction is genetic, and how much does free will play a role? What about our social environments and life experiences?

Addiction specialists have a good understanding of the complex web of factors that drive people towards addiction and know which treatments work. So why are addiction rates for many drugs at an all-time high? Does society even want to find the answers? Sally talks to some of the scientists who wrestle with these questions and to Mel, John, Lavinia and Kevin who reflect on their own experiences of addiction and recovery.

Producer: Beth Eastwood

First broadcast on Tuesday 24 September, 2019.

With smartphones and fitbits, tracking elements of your life has moved on from the dedicated followers of the Quantified Self movement, to something that any of us can do. Accompanied at all times by her step-counting app which she can't help but check several times a day, Claudia Hammond asks whether tracking your every move can affect your behaviour in unexpected ways.

Producer: Adrian Washbourne

First broadcast on Tuesday 29 August, 2017.

In this online age, the internet is a global megaphone, billions of messages amplified and shared, even when they're false. Fake science spreads faster than the truth ever could, unhindered by national boundaries. Mainstream scientists are struggling to respond. The science journalist and writer, Angela Saini, is fascinated by how bad ideas spread and in this programme she investigates the very real impact of online scientific misinformation. From the dangerous anti-vaccination campaigns to those who deny the reality of climate change, she assesses the scale and extent of the threat we face. And she discovers the sinister world of deliberate disinformation where an army of bots and trolls work to sow dissent and confusion in the online space.

Producer: Fiona Hill

First broadcast on Tuesday 17 November, 2019.

Frank Swain can hear Wi-Fi.

Diagnosed with early deafness aged 25, Frank decided to turn his misfortune to his advantage by modifying his hearing aids to create a new sense. He documented the start of his journey three years ago on Radio 4 in 'Hack My Hearing'.

Since then, Frank has worked with sound artist Daniel Jones to detect and sonify Wi-Fi connections around him. He joins a community around the world who are extending their experience beyond human limitations.

In 'Meet the Cyborgs' Frank sets out to meet other people who are hacking their bodies. Neil Harbisson and Moon Rebus run The Cyborg Foundation in Barcelona, which welcomes like-minded body hackers from around the world. Their goal is not just to use or wear technology, but to re-engineer their bodies.

Frank meets the creators of Cyborg Nest, a company promising to make anyone a cyborg. They have recently launched their first product - The North Sense - a computer chip anchored to body piercings in the chest, which vibrates when it faces north.

"I'm a 51 year old bald guy, with no tattoos or piercings" says co-founder Scott Cohen. "This was never a place I thought I'd end up in. Everyone's talking about machine learning, but what we're trying to do is make our brains smarter."

Of course, the marriage of technology and biology is commonplace in medicine, from pacemakers to IUDs. But now 'citizen hackers' are modifying their medical equipment to add new functions. Dana Lewis from Seattle has created her own 'artificial pancreas' to help manage her Type 1 diabetes and released the code online.

But should limits be placed on self-experimentation? And will cybernetic implants eventually become as ubiquitous as smart phones?

Features music composed for The North Sense by Andy Dragazis.

Presenter: Frank Swain.

First broadcast on Tuesday 31 January, 2017.