Concerned about microplastics? Research shows one of the biggest sources is car tyres
A lot of the emphasis on reducing microplastics has focussed on things like plastic bags, clothing, and food packaging.
But there's a growing body of research that shows one of the biggest culprits by far is car tyres.
It's increasingly clear that we simply cannot solve the issue of microplastics in the environment while still using tyres — even with electric-powered cars.
"Tyre wear stands out as a major source of microplastic pollution. Globally, each person is responsible for around 1kg of microplastic pollution from tyre wear released into the environment on average each year – with even higher rates observed in developed nations.
"It is estimated that between 8% and 40% of these particles find their way into surface waters such as the sea, rivers and lakes through runoff from road surfaces, wastewater discharge or even through airborne transport.
"However, tyre wear microplastics have been largely overlooked as a microplastic pollutant. Their dark colour makes them difficult to detect, so these particles can’t be identified using the traditional spectroscopy methods used to identify other more colourful plastic polymers."
"Microplastic pollution has polluted the entire planet, from Arctic snow and Alpine soils to the deepest oceans. The particles can harbour toxic chemicals and harmful microbes and are known to harm some marine creatures. People are also known to consume them via food and water, and to breathe them, But the impact on human health is not yet known.
"“Roads are a very significant source of microplastics to remote areas, including the oceans,” said Andreas Stohl, from the Norwegian Institute for Air Research, who led the research. He said an average tyre loses 4kg during its lifetime. “It’s such a huge amount of plastic compared to, say, clothes,” whose fibres are commonly found in rivers, Stohl said. “You will not lose kilograms of plastic from your clothing.”"
"Microplastics are of increasing concern in the environment [1, 2]. Tire wear is estimated to be one of the largest sources of microplastics entering the aquatic environment [3,4,5,6,7]. The mechanical abrasion of car tires by the road surface forms tire wear particles (TWP) [8] and/or tire and road wear particles (TRWP), consisting of a complex mixture of rubber, with both embedded asphalt and minerals from the pavement [9]."
https://microplastics.springeropen.com/articles/10.1186/s43591-021-00008-w
#car #cars #urbanism #UrbanPlanning #FuckCars @fuck_cars #environment #microplastics #pollution #plastics
Tyre degredation is a lot about fast accelerating and braking. The lower mass and speed of a bike should mean quite a lot less degradation to move one person the same distance (albeit probably slower).
But as you add more cargo or need more spped the equation will change.
Of course, steel wheels on steel rails are pretty durable at high speed and load.
@oo1 @abroad_octopus A typical bike weighs somewhere around 6.8 – 10kg or so. Even when carrying an adult human and some cargo, you're only looking at maybe 80 – 100 kg
By comparison, a Ford 150 pickup truck weighs 1837 kg and 2375 kg. The 1.2 (on average) humans on-board are a rounding error.
So you're looking at the difference between around 100kg on two fairly thin tyres, versus over 2 tonnes over four thick tyres.
What that means is when you hit the brakes on a pick-up truck, you have twice as many tyres are doing an order of magnitude more work to stop a far heavier vehicle.
Now on to road damage. (Road wear and asphalt degradation is the other half of this equation.)
The general rule of thumb is each time you double the weight of vehicle, the amount of road wear increases 16 times. (https://en.wikipedia.org/wiki/Fourth_power_law)
A 10kg bike with a 70kg rider is going to do a miniscule fraction of the damage to a paved road that a 1837 kg pick-up truck or SUV does.
(A 160kg vehicle does 16x the road wear of an 80kg one, a 320kg one does 16x the wear as a 160kg one and 256 times an 80kg one, a 640 kg is 4,096 times an 80kg one, a 1,280 kg vehicle is 65, 536 times an 80kg one, and a 2,560 kg vehicle is 1,048,576 times the road wear of an 80kg one.)
So a motorist, especially an SUV or pick-up truck driver, is likely to cause an order of magnitude less environmental damage on a bike than in a pick-up truck or SUV.