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As the train rattles over Brunel鈥檚 Royal Albert Bridge, a gust of wind buffets the carriage. Through rain-specked windows, I can just about see the town of Saltash cloaked in a thick mist. I鈥檓 probably not the only one entering Cornwall on 4 August hoping for a little bit of global warming to disperse the clouds.

But global warming is precisely why I鈥檓 in Cornwall. The rise in 鈥渆co-tourism鈥� in the southern-most county in England is plain to see. According to a poll by the Cornwall Sustainable Tourism Project, 61% of tourists now say Cornwall鈥檚 environmental reputation contributed to their decision to visit, and a whole new generation of green developments is being built to cope with the influx. But who are the developers turning Cornwall鈥檚 holidays green? And just how easy is it to be a green tourist here?

My brief was to have the greenest holiday I could (helped by the fact that I was only given two days out of the office) and to take in as many of the newest green tourist spots as possible. This ruled out driving or flying down to Cornwall from London, and set limits on where I stayed and what I ate.

The original plan was for me to take my bicycle down on the train and cycle between the various developments I was going to visit. But a glimpse at my itinerary persuaded me otherwise. It would be a 90-mile round trip in just over 24 hours, and I am no Lance Armstrong. A slightly less green plan B was called for.

Fortunately, for my first port of call 鈥� the Scarlet hotel in Mawgan Porth 鈥� architect Harrison Sutton Partnership was able to give me a lift from Bodmin Parkway station. I was still technically in a gas-guzzling car, but as architects Jon Capel and Peter Sutton were going down anyway, I would not be adding to the pollution, I reasoned.

The Scarlet is one of the latest additions to the store of green developments in Cornwall, and is perched on the side of the cliffs above the wide span of Mawgan Porth bridge. The hotel has been built with environmental responsibility in mind by German contractor BauWerk. An expert at off-site timber construction, BauWerk pre-fabricated much of the hotel鈥檚 main structure at its factory and slotted it together 鈥渓ike Lego鈥�, according to director Sven Mangels.

The Scarlet鈥檚 owners wanted the hotel to be as self-sufficient as possible, and so its list of technologies reads like a manual for green developments 鈥� a biomass boiler to heat the entire hotel, ventilation heat exchange to cool it, and both grey water and rain water harvesting (鈥淲e have too much water,鈥� laughs Capel). All the lighting is low energy, with 95% LED bulbs. Materials have been selected either with re-use in mind, or because they are themselves recycled. All the aluminium in the roof is recycled, and even the timber posts around the pool are made from driftwood.

Early project meetings were attended by the team that built the Eden Project, and that building鈥檚 project manager 鈥� former Alfred McAlpine employee Andy Kirk 鈥� was brought in to oversee construction. Capel says the project team met regularly to discuss the progress of the building work: 鈥淲e had four categories of green achievement 鈥� Good, Best, Innovative and Pioneering. Our aim was to get as much into that fourth category as we could.鈥�

The Scarlet claims the building鈥檚 carbon emission rate will be 73% lower than average for a building of this size, but is confident of being able to prove greater sustainable benefits once complete (see box).

Although not a Cornishman himself, Simon Baldwin, development director for the Scarlet, says the county has always been forward-thinking when it comes to the environment. 鈥淚t鈥檚 always been seen as a bit hippyish; druids, magic circles that sort of thing. But I think it鈥檚 to do with the people. There鈥檚 a strong community atmosphere, and the idea that you can live off the land is very attractive.鈥�

It would have been nice to stay in the Scarlet, but unfortunately building work is not quite wrapped up when I visit. Instead, I am put up in the neighbouring Bedruthan Steps hotel, a fifties relic that may not have been built to low carbon standards, but has gained a reputation as Cornwall鈥檚 greenest family hotel. I dine on locally sourced mussels and a pint of Betty Stogs brewed just up the road in Truro. I鈥檓 beginning to enjoy this green living.

The next morning, I鈥檓 faced with a dilemma. I need to get to the Lizard Peninsula, which is 45 miles of meandering country roads away. Figuring my chances of hitching a lift to be low, I do what no self-respecting green traveller should do 鈥� hire a taxi.

But it鈥檚 OK. The Bedruthan Steps鈥� chosen firm goes by the enterprising name of Biotravel Taxis and has a fleet of 12 biodiesel-powered cabs at its disposal. Rob, my friendly driver, tells me they emit half the carbon emissions of a normal car. 鈥淚t doesn鈥檛 get up to a very good speed,鈥� says Rob, 鈥渂ut who needs a fast-moving taxi around here?鈥�

Well, I do as a matter of fact, though whether it is the biodiesel car or the Cornish traffic that makes me half an hour late for my meeting at Trelowarren, I couldn鈥檛 say.

Trelowarren is a holiday resort built in the grounds of a 1,000-acre estate near Helston on the Lizard. Winner of several green awards, it is aiming to be carbon neutral in the next few years, having begun its journey of green development back in 2000. Ferris Irving, the freeholder of the estate, explains why. 鈥淢y thinking was, all the old estates hundreds of years ago were entirely self-sufficient back then, so why can鈥檛 we be?鈥�

With a background as a landscape management agent, Irving was well placed to start making Trelowarren environmentally responsible. The estate has already built eight of 31 green houses. Clad in green oak, the twin-frame buildings are highly insulated so that they will act almost like a Passivhaus building and use up little or no energy in heating. The entire estate, including the outdoor pool, restaurant and stately home, is powered and heated by a central CHP plant that is fed with woodchips from the estate鈥檚 own trees.

The resort鈥檚 financial model is unique in that, rather than own houses which it rents out itself, Trelowarren has timeshare agreements with its clients. Irving is quite aware that people are distrustful, not to say sniffy, about timeshare properties. 鈥淲e鈥檙e not speaking to the timeshare industry, but wealthy people interested in buy-to-let. Owning a second home is not sustainable, so timeshare in the way that we manage it is a green product.鈥�

Irving says the timeshare model gives the estate the financial security it needs to invest in green technologies such as the biomass boiler. He is mulling the purchase of a centrally located display board that will show which areas of the estate are using the most energy. 鈥淧eople don鈥檛 want it shoved down their throat, but I think there is an interest in what resources we use,鈥� he says. 鈥淥ur research says that, for our visitors, environmental responsibility comes fourth on their list of priorities for finding a holiday, after location, quality and level of service. It鈥檚 being driven by the younger generation, I think.鈥�

After a delightful morning wandering around Trelowarren with Irving, it鈥檚 back to the Biotravel cab for the final part of my holiday. Driver Rob attempts to explain why Cornwall is such a haven for environmentalists. 鈥淚 think it鈥檚 because we鈥檙e a bit closer to the earth, closer to the sea,鈥� he says, before quoting some psychobabble about inner living. 鈥淚t鈥檚 not about your thoughts, it鈥檚 about what鈥檚 between your thoughts,鈥� he says, cryptically.

What is between my thoughts at that minute is the possibility of getting public transport, but Rob has already apprised me of the difficulties here. 鈥淭his journey we鈥檙e doing today,鈥� he says, 鈥渨ould take you a whole day to do on public transport. Probably more.鈥� Irving had said much the same. 鈥淭he problem with a Cornish holiday is that it鈥檚 a driving holiday, and there鈥檚 nothing you can do about it. Obviously we鈥檇 like everyone to be driving electric cars, but the technology just isn鈥檛 there yet.鈥�

In the meantime, a biodiesel cab will have to do. Rob drops me in Redruth at lunchtime, where I have an appointment with green developer Cloud Nine. But first I need some food. Spurning the McDonald鈥檚, I opt for a traditional Cornish pasty from a local bakery 鈥� no food miles, I smile. Between mouthfuls, I ask whether the pasties are made on site. The baker looks sheepish. 鈥淚 don鈥檛 know,鈥� she says. 鈥淲e get them off a truck.鈥� She points to a cardboard box, recently a receptacle for frozen pasties, which displays the name of a well-known catering company based in Slough. I shake my head. Regretfully, I throw my half-eaten pasty in the bin.

Perhaps distracted by hunger, I reflect on the eery similarities between the frozen pasty and Cloud Nine鈥檚 business. Just as Slough factory workers put together pasties to ship to Cornwall, so do Cloud Nine assemble eco-friendly timber houses to ship to willing customers across the UK and Europe. Each house is manufactured in about four months, and can be installed on site by Cloud Nine鈥檚 build team in about 10 days.

Although the company sells homes to individuals, it is the holiday market that is reaping the most rewards, says development director Anthony Greenwood. The two-bed unit 鈥� a version of which forms their showhome/office on the outskirts of Redruth 鈥� not only attains level four of the Code for Sustainable Homes, but also meets the stipulations of the Caravan Act. So developers with empty caravan parks can install Cloud Nine eco-homes on the sites without having to apply for a new permit. Some are already doing so 鈥� two eco-homes have recently been installed at Mawgan Porth.

This eco-lodge is altogether a simpler affair than the Scarlet and Trelowarren, having been engineered simply to save its purchasers money on their operating costs. 鈥淭o our clients, limiting their carbon footprint is important, but not as important as what鈥檚 in their pocket,鈥� says Greenwood. 鈥淲e make a pledge that this costs only 拢26 a year to heat.鈥� Air-source heat pumps and heat-recovery ventilation come as standard, but photovoltaics can be installed on the roof if desired.

The eco-home on display at Redruth, known as the 鈥淏ude鈥�, would be a pleasant, if somewhat cramped, place to spend a holiday. Set out rather like a caravan, with beds at one end and living space at the other, it is filled with light and, with its timber cladding and Scandinavian-style patio, could easily sit in natural surroundings without making too much of an impact.

As my holiday draws to a close, it鈥檚 my own impact I鈥檓 worried about; my carbon impact, that is. I need to get to Redruth train station and biotaxi driver Rob is already on his way back to catch the evening swell on his surfboard. Luckily, Greenwood offers me a lift in his Smart Car, meaning my environmental journey ends in one final low-energy trip.

As we drive towards the station, the sun makes a rare but welcome appearance. Today it seems unlikely but Cornwall鈥檚 tourists may be blessed with endless, hot summers in the years to come, so it鈥檚 good to see that its developers and hoteliers are making hay.