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Concerned with the environment but rarely patched tubes? :S
I'm surprised but there's actually a massive article on this:
https://www.bikeradar.com/features/tubeless-sealant-environmental-impact/
hippy
monkdagola
Which is what you get when you've had several punctures seal themselves without you having to stop and change or patch a tube.
Not trying to convert you. I just wouldn't go back to tubes unless in an emergency.
Cost wise, it was £15 for a pair of valves which can be reused basically forever, and about the same again for a bottle of sealant which has set up 5 or 6 tyres.
There's also environmental impact concerns. I rarely patched tubes which I should have done more of but eventually they go in the bin and I think something like 96% of London's bin waste gets incinerated. Sealant is mostly latex which is biodegradable in UV light and Stans I believe has some sand in it. And plastic bottles are recyclable (if we didn't ship it abroad to be landfilled somewhere else under the label of recycling)