From powering cars to feeding farm animals, how using seaweed more can help the planet. We hear how a local business in Barbados is using sargassum seaweed to power cars, providing an eco-friendly alternative for islanders and potentially helping to clear the beaches of smelly seaweed. Also we visit the European company aiming to replace single-use plastics with seaweed-based packaging. And how feeding seaweed to cattle can dramatically cut emissions of planet-warming methane gas.

People Fixing The World from the BBC is about brilliant solutions to the world's problems. We release a new edition every week. We'd love you to let us know what you think and to hear about your own solutions. You can contact us on WhatsApp by messaging +44 8000 321721 or email [email protected]. And please leave us a review on your chosen podcast provider.

(Image: A person holding clumps of dulse seaweed in Canada, James MacDonald/Bloomberg)

Citizenship is a kind of social contract that exists in democracies. To function effectively, members of society need to feel like they can engage with and improve their communities. We take a look at two projects helping people do just that in Portugal. We explore a scheme that has helped 30,000 teenagers team up with politicians to transform their local areas. And we hear how another project has enlisted older people in society to train as agents in disaster prevention and spread their knowledge in the wider community.

People Fixing The World from the BBC is about brilliant solutions to the world's problems. We release a new edition every week. We'd love you to let us know what you think and to hear about your own solutions. You can contact us on WhatsApp by messaging +44 8000 321721 or email [email protected]. And please leave us a review on your chosen podcast provider.

Presenter: Myra Anubi Reporter: Alison Roberts Producer: Claire Bates Editor: Jon Bithrey Sound mix: Hal Haines

(Image: Students at a school in Portugal take part in a MyPolis session, MyPolis)

In 2017, Spanish engineer Pablo Bergasa began an unusual hobby: to design a new incubator for use in African hospitals. Eight years on, he has sent 200 of his machines around the world, and he estimates they have saved the lives of 5,000 babies. Pablo’s incubator costs a small proportion of the price of a regular machine and can run on a battery and a bottle of water. Plus Myra Anubi hears about how a simple but ingenious plastic sheet is saving women from dying after giving birth.

People Fixing The World from the BBC is about brilliant solutions to the world's problems. We release a new edition every week for most of the year. We'd love you to let us know what you think and to hear about your own solutions. You can contact us on WhatsApp by messaging +44 8000 321721 or email [email protected]. And please leave us a review on your chosen podcast provider.

Presenter: Myra Anubi Reporter: Esperanza Escribano Producer: William Kremer Editor: Jon Bithrey Sound mix: Andrew Mills

Food waste is one of the biggest environmental and economic challenges we face — and much of it happens long before the food reaches our plates. In this episode, we meet the people working to tackle the problem in different ways. We hear about the smart sensors which could help cut down waste by measuring when food has actually gone bad rather than relying on one-size-fits-all expiry dates. And in Scotland Myra visits the start-up turning waste from whisky production into fish food.

People Fixing The World from the BBC is about brilliant solutions to the world's problems. We release a new edition every week for most of the year. We'd love you to let us know what you think and to hear about your own solutions. You can contact us on WhatsApp by messaging +44 8000 321721 or email [email protected]. And please leave us a review on your chosen podcast provider.

Presenter: Myra Anubi Producer/reporter: Craig Langran Editor: Jon Bithrey Sound mix: Hal Haines

(Image: Myra Anubi with Euan Kinninmonth at the Eden Mill distillery, St Andrews, Scotland, BBC)