Large scale sporting events often become miniature ecological disasters due to the huge amounts of single-use plastic waste left scattered in Britain’s parkland, roads and lakes each time such an event is held.

A mass sporting event the size of the London Marathon can easily get through 750,000 bottles of water and result in up to seven tonnes of waste – a problem that has not gone unnoticed by environmental groups looking to tackle plastics.

Anyone who has taken part in such an event will be familiar with the carnage at water stations as endless plastic cups or bottles are quickly drained before being carelessly cast aside.

Add to this the thousands of competitors and spectators involved, and each event can rapidly turn into a potent reminder of the world’s plastic crisis.

Responding to the huge amounts of waste churned out by competitive runners, swimmers and cyclists, three events in the south-west of England have pledged to go “plastic free”.

“Sporting events are notorious for generating huge amounts of plastic waste,” said James Harvey, campaign officer at marine conservation charity Surfers Against Sewage.

Mass participation events have the potential to create huge amounts of plastic waste (Pete Wright)

“Plastic products are ubiquitous not just in sports equipment and clothing but also in the hospitality and catering arrangements that support events.”

“It is certainly high in the public conscience, and all mass participation events should be responding,” agreed Russell Seymour, executive director of the British Association for Sustainable Sport.

As part of their campaign to cut down the UK’s single-use plastic consumption, Surfers Against Sewage has introduced its plastic-free communities initiative, in which local leaders aim to cut back on plastic use in their areas.

It is in one of these communities, Croyde and Georgeham, that the first plastic-free sporting events are being launched, starting with the Croyde Ocean Triathlon.

“We want to show that it is possible to put on incredible events in beautiful locations without damaging the environment in the process,” said race director Peter Wright.

To cut down on waste, the team has made efforts to strip single-use plastics from every aspect of their events. On-site caterers must avoid plastic, prizes and signage with be plastic-free, and plastic bags have been banned from the triathlon’s wetsuit transition area.

Energy gel sachets – which have been blamed for the deaths of deer after being discarded by cyclists – are being replaced with locally made flapjacks and protein balls.

As for the drinks stations, the endless plastic bottles will be replaced with compostable Vegware paper cups that will be processed at a local pub.

These efforts are particularly relevant given the aquatic settings of the events being run by Mr Wright and his team. Each one involves a swim either around the Devon coast or in a local lake – the kind of habitats that are bearing the brunt of plastic pollution.

Animals in marine environments are dying after consuming or becoming tangled in plastic, and the breakdown of everyday products into ever-smaller pieces could be resulting in toxic chemicals leaching into the environment.

“It's fantastic to see Devon leading the way with a comprehensive plastic-free approach at these events,” said Mr Harvey from Surfers Against Sewage.

Plastic waste across the world: in pictures Show all 15 1 /15 Plastic waste across the world: in pictures Plastic waste across the world: in pictures A father and son on a makeshift boat made from styrofoam paddle through a garbage filled river as they collect plastic bottles that they can sell in junkshops in Manila. The father and son team earn some three US dollars a day retrieving recyclables from the river. AFP/Getty Plastic waste across the world: in pictures A composite image of items found on the shore of the Thames Estuary in Rainham, Kent. Tons of plastic and other waste lines areas along the Thames Estuary shoreline, an important feeding ground for wading birds and other marine wildlife. Getty Images Plastic waste across the world: in pictures Children collect plastic water bottles among the garbage washed ashore at the Manila Bay. According to the United Nations Environment Programme, at current rates of pollution, there will likely be more plastic in the sea than fish by 2050. AFP/Getty Plastic waste across the world: in pictures Plastics and other detritus line the shore of the Thames Estuary. In December 2017 Britain joined the other 193 UN countries and signed up to a resolution to help eliminate marine litter and microplastics in the sea. It is estimated that about eight million metric tons of plastic find their way into the world's oceans every year. Once in the Ocean plastic can take hundreds of years to degrade, all the while breaking down into smaller and smaller 'microplastics,' which can be consumed by marine animals, and find their way into the human food chain. Getty Plastic waste across the world: in pictures A dump site in Manila in 2013. The Philippines financial capital banned disposable plastic shopping bags and styrofoam food containers, as part of escalating efforts across the nation's capital to curb rubbish that exacerbates deadly flooding. AFP/Getty Images Plastic waste across the world: in pictures Children swims in the sea full of garbage in North Jakarta, Indonesia. Getty Plastic waste across the world: in pictures An Indian woman holds a jar filled with Yamuna river water polluted with froth and toxic foam to be used for rituals at the river bank in New Delhi, India. The Yamuna River, like all other holy rivers in India, has been massively polluted for decades now. The river that originates in a glacier in the pristine and unpolluted Himalayas, and flows through Haryana, Delhi and Uttar Pradesh before merging with the Ganges River in Allahabad, once used to be the lifeline of the Indian capital. Currently, it is no more than a large, open sewer that is choking with industrial and domestic discharge that includes plastic, flowers and debris and has virtually no aquatic life. EPA Plastic waste across the world: in pictures Plastic waste is washed up on South Troon beach in Scotland. Recent reports by scientists have confirmed, plastics dumped in the world oceans are reaching a dangerous level with micro plastic particles now being found inside filter feeding animals and amongst sand grains on our beaches. Getty Plastic waste across the world: in pictures Children collect plastic to be sold and recycled, in a polluted river in suburban Manila. The city's trash disposal agency traps solid waste floating down waterways that was thrown into the water by residents of slums along riverbanks upstream. AFP/Getty Plastic waste across the world: in pictures View of the Carpayo Beach in La Punta, Callao, some 15 km of Lima. In 2013, the NGO VIDA labeled the Carpayo Beach as the most polluted in the country - 40 tons of trash on each 500m2. AFP/Getty Plastic waste across the world: in pictures Trash from Kamilo Beach in Hawaii. Gabriella Levine/Flickr Plastic waste across the world: in pictures A scavenger collects plastic cups for recycling in a river covered with rubbish near Pluit dam in Jakarta. Reuters Plastic waste across the world: in pictures Rubbish fills Omoa beach in Honduras. Floating masses of garbage offshore from some of the Caribbean's pristine beaches are testimony to a vast and growing problem of plastic pollution heedlessly dumped in our oceans, locals, activists and experts say. AFP/Getty Plastic waste across the world: in pictures A man climbs down to a garbage filled river in Manila. Plastic rubbish will outweigh fish in the oceans by 2050 unless the world takes drastic action to recycle the material, a report warned in 2016. AFP/Getty Plastic waste across the world: in pictures Garbage on East Beach, Henderson Island (Pitcairn Islands), in the south Pacific Ocean. The uninhabited island has been found to have the world's highest density of waste plastic, with more than 3,500 additional pieces of litter washing ashore daily at just one of its beaches. EPA

“We are very pleased that the organisers are planning to distance themselves from avoidable, single-use plastics by providing innovative solutions.

“It proves that a different approach is possible and sets a new standard for others to follow.”

While the scale of the events being run by Mr Wright and his team in the South-west is relatively small – their largest plastic-free race will involve no more than 1,000 people – they are hoping to set an example to the sector’s bigger players.

“We want to lead the way in making events as environmentally sustainable as possible, and will share our lessons and experiences with other event organisers in the UK and beyond,” said Mr Wright.

He added they want their events to serve as a contrast to “something like the London Marathon where they are giving out plastic bottles that are dropped on the course”.

“Those events could do so much more to reduce the scale of single-use plastics.”

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According to Mr Seymour, the move is part of a wider trend within the sporting community to acknowledge the environmental harm that results from sporting events.

“Whether it is a mass participation event or a spectator event, sport is looking to reduce its impacts,” he said.

Sally Barney, head of major events at the Royal Parks – the site of an annual half marathon – said there is a “general awareness” now among event organisers that sustainability needs to be factored into decision making.

“Plastic is such a big deal these days,” she said.

“Obviously runner experience has to come high on the priority list, but that’s not completely opposite to being as sustainable as possible.”

A recent report by the Climate Coalition revealed the impact of environmental changes on sport. It also showcased how sport is increasingly playing a part in tackling climate change by reducing emissions and inspiring others to follow.

“The sport sector has the opportunity to recognise these impacts and to communicate these issues to our spectators, fans and participants as a trusted ambassador in a non-political way alongside actions that individuals can take,” said Mr Seymour.

Plastic is becoming one of the defining environmental issues of our time, with government scientists revealing the quantity of plastic pollution in the ocean is set to treble within a decade.

Campaigners have warned that action on this issue must come from governments and businesses, but there is also a role that individuals and local groups can play.

“We all now know the devastating impact of plastic pollution on our marine environment, and more than 80 per cent of marine litter comes from the land,” said Allison Ogden-Newton, chief executive of environmental charity Keep Britain Tidy.