Mining is set to return to Cornwall as tin and tungsten prices continue to rise. Plus a rare earth metal called Indium, a key component in smart phones and flat screens, is enticing prospectors back to the mines of the South West.

Tin mining has long been just a relic of Cornwall's past; a landscape dotted with old overgrown chimneys being the only evidence of the wheals once found all across the county.

The last miners left South Crofty mine, near Redruth in the heart of Cornwall in 1998 when the price of tin made mining in the area unviable, but now investors and geologists have turned their attention to some of the other minerals lying underground alongside the tin. Rare earth metals are also hiding below the surface at South Crofty and could help bring prosperity to a much maligned part of the country.

Just across the county border in Devon, mining is set to begin at Hemerdon, just outside Plymouth. Hemerdon is home to the fourth largest Tungsten deposit in the world and the price of tungsten is soaring.

Tom Heap meets the new prospectors hoping to make the area profitable once again.

Presenter: Tom Heap

The seas around the Antarctic contain some of our last healthy fish stocks. Tight regulation and vicious weather conditions have kept most trawlers out of the southern waters but the global demand for protein could push more fishermen to sail to the frozen south.

For 'Costing the Earth' the chef Gerard Baker travels to South Georgia to hear how scientists hope to maintain the health of the southern oceans in the face of overwhelming odds. Could their experience help the rest of the world secure the future of fish?

Britain's sand dunes are running out of time. Coastal development and well-meaning conservation plans have locked them in place, frustrating the natural ebbs and flows that attract some of our rarest birds, insects and toads.

On the coast of South Wales the conservation group Plantlife has decided to take drastic action. A fleet of bulldozers has appeared at Kenfig Sands, home of the rare fen orchid. The plan is to reconstruct this massive dune system, giving space for the natural processes of wind and wave to mould the landscape, returning the natural mobility that so many of our dune species need.

Is Mother Nature being given a much-needed helping hand or should we leave what remains of our dunes well alone? Tom Heap reports from the Welsh coast.

Producer: Alasdair Cross.

The outbreak of Schmallenberg disease amongst sheep and cattle on British farms has provided a powerful reminder of how novel infections can develop, spread and kill before the authorities have a chance to react.

Scientists are still working hard to fully understand the virus and a vaccine is still some way off so what can we do to protect ourselves against future disease outbreaks?

And how can we discover what diseases could be heading our way? Tom Heap heads to the Kent marshes in search of one of the potential carriers of nasty illnesses: Culex modestus. It's known to be a successful carrier of West Nile Virus - a paricularly nasty illness - and while the mosquito has been found on the marshes of Kent the disease has not made it's way to the UK yet.

Costing The Earth also discovers the vital role social media could play in monitoring future epidemics.

Intensive farming, international travel, global trade and climate change are all playing a role in changing the diseases we encounter. In 'Costing the Earth' Tom Heap asks what epidemics we should expect in the future and examines the readiness of government, the medical profession and the pharmaceutical industry.

Producer: Martin Poyntz-Roberts.

In the fight against climate change the peatlands of the British Isles are one of our greatest assets. A healthy peat bog can absorb more carbon dioxide and store it for longer than forests of a similar size. But we're still destroying our peat at a frightening rate. It's mined for use by gardeners, it's burned in power stations, taken by traditional peat-cutters and ravaged by moorland fires.

In 'Costing the Earth' Tom Heap meets the people leading the fightback. He takes to the skies above the Peak District where helicopters are dropping rocks and heather brash onto remote hillsides to heal the wounds caused by two centuries of acid rain. He joins the teams blocking drains and planting pods of sphagnum moss in an effort to bring carbon-sucking life back to the blasted heaths of the peaks.

Producer: Alasdair Cross.

The car was once the symbol of youthful cool. From James Dean through Steve McQueen to Ayrton Senna the car was a symbol of freedom, daring and sexual allure. Today the young of the western world have turned their back on the car. Half of American 17-year-olds have a driver's licence today compared with three-quarters in 1998 and in Europe car sales are down whilst public transport use is up.

Is it simply that insurance costs have rocketed for young drivers? Is it because the young remain in education for longer? Are our youth becoming more environmentally aware or is it because cars have become safe, reliable and downright dull?

In 'Costing the Earth' Tom Heap takes to the road from the Streets of San Francisco to the inner ring roads of the West Midlands to find out if the age of the car is coming to an end. He meets the marketing men, the manufacturers and the innovators struggling to retain a place in our affections for the motor car.

Producer: Martin Poyntz-Roberts.

The Fukushima disaster in Japan brought the nuclear revival to a juddering halt. But what if there was a cheaper, safer way to create nuclear energy?

Thorium is an abundant radioactive element that offers the prospect of producing power without the danger of reactor meltdowns or the enormous amounts of long-lived waste left behind by conventional nuclear power plants. The Chinese and Indian governments have advanced plans for thorium reactors whilst French and British scientists are already developing the technology that can turn the theory into commercial reality.

In 'Costing the Earth' Julian Rush investigates the prospects for a new wave of 'safe' nuclear energy.

Every time more than two millimetres of rain drops onto the streets of London a combination of raw sewerage and rainwater overwhelms the Victorian sewers and pours into the River Thames, killing fish and disgusting the users of the river.

The solution being proposed by Thames Water is an enormous 15 mile long tunnel buried beneath the river as it flows through the city. There's little doubt that it will clean up the river but is the health of a few fish really worth over £4 billion of Londoners' money and years of disruption for those who live close to the tunnel construction sites?

In 'Costing the Earth' Professor Alice Roberts descends into Joseph Bazalgette's Victorian sewer system to see the extent of the problem and the scale of the new works.

Producer: Martin Poyntz-Roberts.

Bambi has never had it so good. Changes in farming fashion now provide deer with delicious things to eat and warm places to sleep all winter long. The result is a big increase in numbers and a rapid geographical spread, taking our native and introduced species into the most urbanised parts of our islands.

In 'Costing the Earth' Tom Heap investigates the causes of the deer boom and some of the unexpected impacts. Deer take a heavy toll on young trees, enraging foresters and ruining the prospects for ground-nesting birds like nightingales. They're also meeting increasingly grisly ends, killed by on-coming cars or targeted by poachers armed with crossbows or air guns.

So should we wring our hands or celebrate the success of our largest land mammals? Should we cull and control or aim to make a profit from nature's bounty? Tom joins a team of specialists from Scottish Natural Heritage for a late night deer count through urban Scotland and meets a stalker who is offering wealthy Germans the chance to bag a lowland stag.

Producer: Alasdair Cross.

In the battle to protect crops and eradicate disease, scientists are turning to ever more ingenious ways to defeat the old enemy - insects. Instead of just going for the kill, they're finding ways of changing behaviour, of recruiting the predator's enemies as our friends. They're using genetic modification and other breeding techniques to ensure that insects breed, but the young don't survive long enough to do any damage. So can we make insects do our bidding and create a world without pesticides? Professor Alice Roberts investigates for 'Costing the Earth'.

Producer: Steve Peacock.