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Audience takeover: Your questions answered

Answers to your questions about regrowing the rainforest and other stories we’ve covered

• 23 mins

From prison to star employee

Why former criminals are being chosen for jobs at hundreds of companies in a small US city

• 27 mins

Riding the solar railway

How to make train journeys greener using the power of the sun

• 24 mins

Perovskites: The future of solar?

A new kind of solar cell is made by drying a special liquid on a surface

• 23 mins

Building with fungi

Growing packaging, coffins and whole houses out of eco-friendly mycelium

• 23 mins

Making meat in a lab

How meat grown in labs could reduce our environmental impact

• 24 mins

Saving mums and their unborn babies

Women in Nigeria have come up with an emergency transport scheme that is saving lives

• 24 mins

What happened next to our problem solvers

Hydrating sweets for the elderly go on sale and how a housing experiment coped with Covid

• 24 mins

Can doughnuts save the planet?

Doughnut economics in action - how we can live well and save the planet at the same time

• 23 mins

The solutions whisperer

Dhruv Boruah’s mission is to inspire other people to solve problems facing the planet

• 23 mins

A forest down your street

The tiny urban forests bringing nature to the heart of the city

• 24 mins

The spacesuits saving mothers’ lives

Suits originally designed for astronauts are helping midwives save lives

• 23 mins

The breath of life

A clever way to provide life-saving oxygen

• 24 mins

How to store power in soil and salt

Batteries made of building blocks and volcanic rock

• 23 mins

Beating superbugs

The small team of Indian scientists who think they’ve found a new way to kill superbugs

• 25 mins

Tackling sport’s concussion problem

How the latest technology is helping to tackle head injuries in sport

• 24 mins

The secret to making your stuff last longer

Clever ways to persuade people to fix old things instead of throwing them away

• 24 mins

The magic greenhouse

A greenhouse powered by the wind has made it possible to grow crops on arid land

• 23 mins

Using satellite photos to help distribute cash

Togo has found a new way to send emergency cash to people struggling in the pandemic

• 23 mins

How to reuse a demolished building

Can you construct a building by reusing materials from ones that have been knocked down?

• 23 mins

Watching out for Gran with help from her toaster

How we could improve care for the elderly by monitoring their use of home appliances

• 23 mins

Helping animals cross the road and other obstacles

The special bridges that are helping to save slow lorises and reunite rare monkeys

• 23 mins

Shred it yourself: The DIY plastic recyclers

Machines to shred, melt and mould waste plastic are popping up around the world

• 23 mins

Pedal power: How bicycles can change lives

One man’s mission to transform millions of lives by selling them bicycles

• 24 mins

The detection dogs tracking poachers and Covid-19

Marlo is sniffing out coronavirus in the UK, and Thor is tracking poachers in Tanzania

• 23 mins

The forest sound detectives

Scientists are checking up on the health of forests by analysing the sounds in them.

• 23 mins

Turning oil platforms into reefs

A home for marine life, but perhaps not in the place you’d expect

• 22 mins

Regrowing the rainforest

It has taken 40 years, but this man has regrown a patch of rainforest in the Amazon

• 28 mins

Catching up with the problem solvers

Are stickers still saving lives? Was a coral reef repaired?

• 23 mins

Turning the desert green

One man's plan to make the Sinai desert fertile

• 24 mins