Episodes categorised as 'Factual: Science & Nature: Nature & Environment' available now on BBC iPlayer

Helen Mark is in Northern Ireland to follow the Ballinderry River from source to lough.

Lionel Kelleway searches for his own autumnal 'tufty' red squirrel in the Lake District.

Helen Mark goes in search of the wild animals of Gloucestershire.

Lionel Kelleway explores the important benefits of ivy to British wildlife.

Lionel Kelleway visits the Arne RSPB reserve in Dorset to see the rare Dartford warbler.

Helen Mark and Time Team's Mick Aston investigate the story of the Hanbury Crater.

Lionel Kelleway heads to Purbeck to see sika at the start of the rutting season.

Matt Baker discovers some alternative methods of transport in the New Forest.

Matt Baker explores plans to create a new Lanarkshire town based on Robert Owen's ideals.

Queen guitarist Brian May visits a village captured in time by a Victorian photographer.

Tom Heap on the prospects for the United Nations' crucial climate change conference.

6/6. Clare Balding walks the final stage of St Oswald's Way.

Can technology remove the guilt from flight? Tom Heap and Bruce Dickinson investigate.

5/6. Clare Balding walks the fifth leg of St Oswald's Way, from Rothbury to Simonside.

9/9. A poet and a stone are companions on a most unusual journey to Australia.

Tom Heap finds out if eco-activists are facing their toughest challenges yet.

4/6. Clare continues her journey in the company of a group of local walkers, led by Jon Monks.

8/9. An unusual sound safari, eavesdropping on the world of insect sounds.

Are charity mountaineers damaging our highest peaks? Alice Roberts reports.

3/6. Clare walks the third stretch of the route, from Alnmouth to Warkworth.

7/9. The search to find the first gorilla brought out of Africa to live in captivity.

Alice Roberts investigates the loss of vitamins and minerals from our staple foods.

2/6. Clare walks the second section of the route, from Belford to Beadnell, via Bamburgh Castle

6/9. Brett Westwood visits the Calf of Man, a rugged island to the south of the Isle of Man.

Tom Heap tests the notion of a 'Supergrid' linking renewable resources across Europe.

1/6. Clare walks the first section of the route, from Holy Island to St Cuthbert's Cave.

5/9. Chris Sperring discovers that the Severn Estuary is a vital nursery ground for marine fish

Tom Heap asks if we are looking in the wrong place for solutions to climate change.

Helen Mark meets Booker-nominated author Sarah Hall at Haweswater Reservoir in Cumbria.

4/9. Brett Westwood asks how feasible it is to set up a conservation area in the sea.

Tom Heap finds out if dates on food are past their sell-by date.

Lionel Kelleway is taken to some special grassland to see its wild flowers.

Matt Baker visits London' s Hyde Park to discover the history of the Serpentine Lake.

3/9. Tessa McGregor explores the Sea of Cortez, a whale and dolphin hotspot off Mexico.

Can we break the log-jam holding back renewable energy? Tom Heap investigates.

Lionel Kelleway finds out about a programme to re-introduce the Great Bustard to Britain.

Helen Mark unearths some new truths about Dunluce Castle in County Antrim.

2/9. Brett Westwood investigates the potential for restoring large areas of heathland.

Lionel Kelleway visits a valley in Exmoor National Park in search of a rare butterfly.

Helen Mark visits Kirksanton, a possible site for a new nuclear power station.

1/9. Brett Westwood encounters the large blue butterfly on the Somerset Downs.

Lionel Kelleway heads to Dartmoor to get close to a juvenile cuckoo and its foster parents

Matt Baker reports on the dispute going on between anglers and canoeists on Welsh rivers.

Helen Mark looks at the battle between water supply and wildlife at Rutland Water.

How can science can stop an upsurge in the slaughter of African elephants for their ivory?

Matt Baker discovers the Second World War secrets of the Peak District.

Helen Mark on the battle between fishermen and conservationists over the Firth of Lorne.

Helen Mark explores the history of Doggerland, a land lost beneath the waves.

Matt Baker takes a fresh look at one of our most visited landscapes.

Helen Mark meets the Scottish islanders determined to become self-sufficient in energy.

2/2. Ayisha visits the Egyptian settlement of Abu Minqar.

Tom Heap visits a farm preparing its Longhorn Cattle for the Royal Show in Warwickshire

6/6. Clare Balding joins two polar explorers to walk in Scotland's picturesque Wester Ross.

1/2. Ayisha Yahya explores predictions that some deserts could turn greener in the future.

Topical farming magazine. Elinor Goodman visits a bison farm in Wiltshire.

5/6. Clare Balding walks on the Scottish peninsular of Cromarty with author Douglas Willis.

Professional tree climber James Aldred climbs one of Britain's tallest trees.

Lionel Kelleway is guided by two National Trust experts around a 100-year-old orchard.

4/6. Clare Balding meets Garth Gunn and his son Craig on the Isle of Purbeck in Dorset.

Marine biologist Peter Heyward and Lionel Kelleway search for starfish.

3/6. Clare Balding walks in Wiltshire with 'modern-day Troubadours'.

7/8. Chris Sperring explores declining seabird numbers and asks if it represents a crisis.

Lionel Kelleway tries to get close to the grass snake, Britain's largest native snake.

2/6. Clare joins blind walker Rob Davies at Hulne Park, on the Duke of Northumberland's estate.

6/8. Brett Westwood searches for the reasons behind the declining numbers of migrant songbirds.

How the Carteret Islands are slowly being submerged by the rising sea.

Lionel Kelleway gets very close to the marsh harrier.

1/6. Clare Balding joins The Times' music critic Richard Morrison in Suffolk.

5/8. Are we being consistent in our approach to non-native plants and animals?

How arguments about the protection of the Amazon rainforest are playing out in Brazil.

Helen Mark explores the north Devon coastline.

4/8. Huw Cordey meets the people of the tiny island of Anuta in the South Pacific.

Tom Heap examines the carbon footprint of older people.

Matt Baker visits England's most scenic railway line, from Settle to Carlisle.

3/8. Paul Evans investigates the Amazon, the biggest area of rainforest left on Earth.

Alice Roberts discovers the potential savings available by harnessing the power of sewage.

Helen Mark joins historian Peter Edwards to visit the Worcestershire village of Rushock.

2/8. Paul Evans visits Dorset to find out why heathland birds don't welcome hordes of visitors.

Matt Baker finds out just how idyllic life was for Mesolithic man on the Isle of Skye.

1/8. A close encounter with two birds that revealed an exquisite courtship performance.

Tom Heap reports on the Antarctic Treaty.

Helen Mark explores the birthplace of the Industrial Revolution.

How the parklands and wetlands of the Lea Valley are being transformed for London 2012.

Caz Graham joins the tenth anniversary celebrations of Keswick's Theatre by the Lake.

Helen Mark meets the people and wildlife that make their home on Snowdon.

Helen Mark visits Scotland to find that the freshwater pearl mussel faces new threats.

Matt Baker investigates Cumbria's industrial coastline, which is being given a makeover.

Helen Mark finds out how whisky production has shaped Speyside in Scotland.

Matt Baker travels to Essex to see the vast area the RSPB is turning into a nature reserve