主播大秀

Bangladesh鈥檚 biker girls

The motorbike taxi app where the drivers and passengers are all women.

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The concrete cleaners

Making cement that locks in carbon dioxide instead of releasing it into the atmosphere

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Oysters to the rescue

The humble oyster is helping to keep the oceans clean and protect shorelines

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A new way to detect an invisible poison in water

Scientists hope a new test will save millions from drinking arsenic in their water

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Meeting Colombia鈥檚 鈥榲iolentologist鈥�

How a doctor in Colombia changed the way cities monitor and prevent violence

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The snakebite squad

A team in Kenya has introduced motorbike ambulances for people bitten by snakes

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Spotting the sound of a cardiac arrest

Copenhagen is experimenting with a new way of analysing emergency calls

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Turning waste into energy

Instead of sending all our waste to landfill, some companies are using it to make energy

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Shopping for a better life

How a grocery store is bringing healthcare to people who can鈥檛 usually afford it

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The town rethinking the future of energy

Energy companies have come together in Finland to tackle climate change

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Gaming for good

Gamers are helping scientists to analyse research and develop new drugs

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The future of freight

Designing eco-friendly lorries to make cleaner, greener deliveries

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How to save the banana

The banana is under threat from a deadly disease. Meet the people are trying to save it

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How to stop fires destroying whole neighbourhoods

The innovative fire alarm designed to protect South Africa鈥檚 poorest communities

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Stopping abuse with protection dogs

Women who have left abusive partners are learning how to train their own protection dogs

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Saving the world鈥檚 ice

Silica beads and whiter clouds - ideas to stop the world鈥檚 ice melting

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Turning kids into entrepreneurs

Children in Uganda are running their own businesses thanks to special classes in school

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Convicting more rapists

Rapists often get away without being convicted 鈥� South Africa thinks it has an answer

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Making your deliveries greener

Four clever ways to reduce carbon emissions from deliveries

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Checking in with the problem solvers

Stopping forest fires with goats and more 鈥� an update on projects we鈥檝e visited before

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How to move the Earth

The plans to use lasers or asteroids to move our planet away from the sun

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The pharmacists fighting high drug prices

When drug prices went up, pharmacists stepped in to make medicines themselves

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Forecasting volcanoes

Preparing for disasters long before they strike rather than rescuing people afterwards

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Running to do good

Forget the treadmill - these people have turned doing good deeds into a workout

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Fighting depression together

Women in Uganda are learning how to treat their neighbours for depression

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The miracle cure: Exercise

If exercise were a drug, almost everyone over 65 would want to take it

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The good lads

Working with men and boys to tackle everyday sexism

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Meet the neighbours

People in these flats promise to spend two hours a week together to tackle loneliness

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A safe place to be gay

An idea used in video games is helping LGBTQ people in the Middle East talk safely online

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Audience takeover:Your feedback

鈥淔abulous idea鈥� or 鈥渨aste of money鈥�? Your thoughts on solutions we鈥檝e covered.

• 23 mins