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Reds Return

Could the revival of the pine marten be bad news for grey squirrels and good for the reds?

• 30 mins

Cycle City

Tom Heap saddles up to find out if Britain is really about to become a nation of cyclists.

• 30 mins

Eco-Cities

Tom Heap investigates whether eco-cities are living up to their promise.

• 30 mins

China's Water Revolution

China needs more water urgently. Isabel Hilton examines the nation's options.

• 30 mins

Britain's Environment: The Debate

How will the next government tackle Britain's environmental problems? Tom Heap reports.

• 30 mins

The Ozone Hole Thirty Years On

Peter Gibbs finds out if the ozone layer hole is healing 30 years on from its discovery.

• 30 mins

Electric Island

Tom Heap visits the Scottish island that can power itself.

• 30 mins

Sounds of the Seas

How noisy is the underwater environment? Tom Heap dips beneath the surface to find out.

• 30 mins

Britain Rules the Waves

Can Britain save the oceans by protecting its overseas territories? Tom Heap reports.

• 28 mins

Oceans of Acid

Professor Alice Roberts asks how ocean acidification will alter sea life.

• 30 mins

Where Have All Our Gardens Gone?

Urban Britain is paving over its front gardens. Jheni Osman discovers the impact.

• 30 mins

Lungs, Lies and Automobiles

Have we been lied to about air pollution? Tom Heap investigates.

• 30 mins

Paying For Our Parks

The National Parks are exploring new commercial opportunities. How far should they go?

• 30 mins

Coast: 50 Years of Change

A new report reveals how the UK's coast has changed over the last 50 years.

• 30 mins

Antipasto Agony

Bad news for lovers of tapenade and pesto - olive trees are succumbing to a new disease.

• 30 mins

River Quality

Tom Heap investigates claims England's rivers are under threat from 'insidious' pollution.

• 30 mins

Murder in Cambodia

Peter Hadfield investigates the illegal trade in Siamese rosewood.

• 30 mins

In Conversation with David Attenborough

David Attenborough and fellow experts join Tom Heap to preview the Paris Climate Summit.

• 30 mins

Britain Disconnected

Is extreme weather pulling Britain apart? Tom Heap reports.

• 30 mins

Requiem for a King

Tom Heap tells the story of coal from the Industrial Revolution to its apparent demise.

• 30 mins

The City That Fell into the Earth

How do you move a city? Lesley Riddoch travels to Arctic Sweden to find out.

• 30 mins

Acoustic Ecology

Can the sound of the Amazon help to save it? Peter Gibbs reports.

• 30 mins

New York's Big Green Clean

Tom Heap visits New York to find out how the city is cleaning up its dirty waterways.

• 30 mins

The Environment after Exit

Tom Heap examines the potential impact of an exit from the EU on the environment.

• 30 mins

Litter

How do you persuade a throwaway society to use a bin? Chris Ledgard on litter campaigns.

• 30 mins

Beasts of the Border

Tom Heap examines the wildlife impact of Europe's new borders.

• 30 mins

From Iceland with Love

Tom Heap finds out how Iceland could solve Britain's energy crisis.

• 30 mins

Digging Climate Change

Professor Alice Roberts asks if archaeology can help us understand climate change.

• 30 mins

The Mars of the Mid-Atlantic

Peter Gibbs explores Ascension Island, a barren Atlantic rock made fertile by man.

• 30 mins

After Chernobyl

How the fallout from Chernobyl changed Germany forever. Julian Rush reports.

• 30 mins