In the UK thousands of people spend many hours - and pounds - looking to burn off energy at gyms and while playing sports. Could that energy be harnessed and used to power some of our gadgets and devices? Tom Heap puts on his trainers and breaks a sweat to find out.

Trevor Baylis's wind-up radio revolutionised access to information in Africa by using human power rather than expensive batteries. The inventor also demonstrated his piezoelectric phone-charging shoes by walking across the Namib desert and he says there's far more potential for inventions that use our heat or movement to power the devices we use - saving on the mountain of batteries we throw away and replace each year. It also makes lighting and phone charging easier for countries not on the electric grid.

It's possible you've even had some of your energy captured without realising. Tom sees the floor tiles storing energy from commuters', shoppers' and schoolchildren's footsteps to help power lighting. He learns about ink patterns on clothing that use energy from our movement to monitor our health and hears about futuristic implantable devices which could be powered by the body's internal movements.

The experts say we won't be going off-grid to power our homes with exercise bikes but even tiny devices could be major players in helping our energy demands.

Producer: Anne-Marie Bullock.

The first attempt in England to turn a landscape back into a wilderness is 10 years old this year.

In this week's Costing The Earth, Miranda Krestovnikoff visits Ennerdale Valley, on the Western edge of the Lake District, to find out how the scheme is progressing.

Rewilding, as the scheme has become known, allows natural processes to take place, in order to return the habitat to as natural an environment as possible. The landscape has been managed in such a way that natural flora and fauna have been encouraged back to the valley. Miranda meets those involved in returning the valley to a wilderness.

In order for the project to be be a success, the major land owners in the valley: the National Trust, the Forestry Commission, Natural England and United Utilities have all been working together.

Miranda discovers how successful the rewilding project has been and whether or not schemes of this type are worth attempting elsewhere in the UK: a country that has very little wilderness that has been untouched by human hands. She also finds out the vital role visitors to the area play in keeping the landscape alive.

Presenter: Miranda Krestovnikoff

Rising sea temperatures are already bringing new species to our shores. Sunfish, sea turtles and basking sharks are common sights. But what can we expect to see in the fishing nets by 2060?

The key to the species that visit these shores is the plankton on which they feed. Species of plankton more usually found in areas of the southern Atlantic ocean are now turning up on our shores, and so are the fish and mammals that feed on them.

So will tropical species replace the cod and haddock in Britain's fish and chip shops? Will great white sharks patrol our beaches? Tom Heap takes to the water to predict the state of our seas in fifty years.

Will we all be eating Boarfish and chips? Red Mullet Goujons? Tom Heap asks whether the waters around the UK are set to become home to exotic whales and dolphins such as these pictured below.

Producer: Martin Poyntz-Roberts.

All photos courtesy of the Sea Watch Foundation library.

According to the latest predictions on global warming Britain from the 2060s could begin to look rather like Madeira. In the first of a two-part investigation into the impact of climate change Tom Heap visits the island 350 miles from the coast of Morocco to find out how we might be living in the second half of the 21st century.

With a climate dominated by the Atlantic, a wet, mountainous north and a warm, dry, over-populated south Madeira already resembles Britain in miniature. The settlers who arrived from Portugal in the 15th century developed a complex farming system that found a niche for dozens of crops, from olives and oranges to wheat and sweet potatoes. Could British farmers prepare for a less predictable climate by studying the delicate agricultural arts of the Madeirans?

Irrigation systems bring water from the wet north of Madeira to the parched south where 90 percent of the population live and most of the tourists visit. Should Britain accept the inevitable and invest in the water pipes that could keep the South-East of England hydrated with Scottish and Northumbrian water?

Tom will also be studying the island's wildlife. Can Britain expect semi-tropical insects and reptiles to invade the south as our mountain hares and ptarmigan die out in the north? Or does Madeira's broad range of species offer hope of something subtly different but just as fascinating from the 2060s?

Producer: Alasdair Cross.

Jellyfish are taking over the world's oceans, eating baby fish and driving marine ecosystems back to the primitive Cambrian era. Or are they? Although incidents of human-jellyfish interaction are on the increase, it's hard to be sure that the jellies are really increasing in number over the long term. But then again, if we wait till we are sure, won't it be too late? Miranda Krestovnikoff investigates.

Producer: Jolyon Jenkins.

There's a drought in most of England but plenty of water elsewhere. Why not move it? Yes, water is heavy, but it's also slippery and moves down hill. Tom Heap investigates why water companies seem so reluctant to trade with each other. Some suggest it's because they make their profits by pouring concrete in their own patch, rather than by doing deals with their neighbours. Others think it's because they don't pay a realistic price for the water they take out of rivers in the first place. So are the problems of water shortage as much to do with the economics of the industry as with the lack of rain?

Producer: Jolyon Jenkins.

In the rush to come up with new, clean ways to produce electricity many people assumed that dirty old coal was a fuel of the past, a relic of the Industrial Revolution. However, coal's dominance of the market in electricity generation is actually increasing. China is building many new coal-fired power stations. The booming economies of Poland, Australia and South Africa are almost exclusively reliant on coal whilst even the Germans have turned back to the black stuff as they abandon nuclear power.

In 'Costing the Earth' Tom Heap investigates the dramatic revival of Old King Coal and asks if there are any realistic ways to turn our cheapest, most abundant fuel into a clean source of energy.

Producer: Martin Poyntz-Roberts.

Genetically-modified crops provoked scepticism and outright objection from many environmentalists and food campaigners when they were first launched in the 1990s.

A new wave of GM crops is on the way but this time, the scientists claim, they will offer clear benefits to the public. There will be orange juice that helps you lose weight, grains fortified with the zinc our bodies need and new sustainable sources of Omega-3. In 'Costing the Earth' investigates the second generation of GM and asks if, this time, British consumers will welcome them onto the supermarket shelves.

Producer: Alasdair Cross

It is the third-largest natural harbour in the world but even so, it isn't deep enough for modern ships. Falmouth in Cornwall wants to invest £100 million to modernise its ship-repairing docks and facilities for cruise liners.

The project would create hundreds of jobs, protect existing businesses and bring cash-laden tourists into the surrounding area. It depends on being able to dredge the channel into the harbour and that's where the problem lies - to do so would mean digging up rare calcified seaweed called maerl which is protected by law and lies in a special conservation area.

It's a classic stand-off between economic development and protecting the natural environment- now specialist marine scientists have been called in to see whether both sides can be satisfied. Tom Heap gets to grips with rare seaweed and big bucks in Cornwall for 'Costing The Earth'.

Producer: Steve Peacock.

Last spring huge swathes of the British countryside, from Dorset to the West Highlands erupted in flames. In the wake of a dry winter and drought orders across the south there's a real risk of another year of serious wildfires.

In 'Costing the Earth' Tom Heap investigates the causes of forest and moorland fire and the innovative ideas that could help us predict them, and fight them.

At Crowthorne Forest in Berkshire, site of the most destructive of 2011's fires he meets the young families evacuated from their homes who are now planting saplings that should prove to be more fire-resistant than their charred predecessors. In Northumbria he joins the local fire and rescue service for an exercise designed to test their speed and efficiency in the face of fire. And in the forests of South Wales he finds out why the region is the arson capital of the UK.

Producer: Alasdair Cross.