• Alfredolin@sopuli.xyz
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    5 days ago

    It is absolutely not OK that there still is a tax exemption on any flight whatsoever.

    That and the shameless dynamic pricing of trains.

    • JasSmith@sh.itjust.works
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      5 days ago

      Flying receives far lower subsidies and infrastructure spending than rail. The EU subsidises air travel (including said avgas tax exemption) to the tune of around €30–40 billion annually depending on what you include and what you consider to be a “subsidy.” Using similar criteria, rail is subsidised to the tune of €40–75 billion per year. So rail gets a lot more investment despite it serving 16% fewer travel kilometers per year in the EU than air travel.

      • trougnouf@lemmy.world
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        4 days ago

        “16% fewer travel kilometers”, meaning trains are used massively more often since they typically don’t cover nearly as many kilometers. People would probably chose to take the train more often even if it meant traveling to less distant destinations if the planes were more expensive.

      • Gsus4@programming.dev
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        5 days ago

        You’ve convinced me: rail should be subsidised more and air travel should get nothing (unless there is no equivalent train route e.g. across the sea) .

      • Log in | Sign up@lemmy.world
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        5 days ago

        Conservatives sure like to stick up for the worst polluters. You could just tax the fuel like any other industry.

  • plyth@feddit.org
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    5 days ago

    It’a apples to oranges. Pricing policies are different. Only few get the cheapest airline tickets.

  • plyth@feddit.org
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    5 days ago

    There is also a hidden cost from the tracks.

    A rail track of 3m for 100km used for solar cells would generate enough electricity to transport 37500 passengers per plane.

    Solar cells generate 2kWp per 10 square meters, which are 2MWh per year which is 5kWh per day.

    300ksqm generate 150MWh per day.

    4l kerosine per pessenger per 100km are about 40kWh.

    150MWh are enough for 37500 passengers.

    It’s not renewable but influences the economics.

    • SkaveRat@discuss.tchncs.de
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      5 days ago

      That’s the most idiotic calculation I’ve ever read since I came across the brain melting insanity of solar roadways

          • plyth@feddit.org
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            5 days ago

            How is that relevant? The article was an economic comparison, not an ecological one.

            For an ecological comparison half the numbers. Synthetic fuels are only twice as expensive as fossil jet fuel which should mostly be caused by the needed energy.

            By 2019, fossil jet fuel production cost was $0.3-0.6 per L given a $50–100 crude oil barrel, while aviation biofuel production cost was $0.7-1.6, needing a $110–260 crude oil barrel to break-even.

            https://en.m.wikipedia.org/wiki/Aviation_biofuel#Production

    • GissaMittJobb@lemmy.ml
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      5 days ago

      I’m not really sure what point you’re trying to make here -

      It’s not like rails are in any significant way displacing solar panels.

      If one were motivated, you could use the same land for tracks and for solar panels by raising the solar panels above the tracks and catenaries, making double use of the land at the expense of having to build platforms for the panels.

      Finally, solar energy can’t be used to transport passengers by plane since electric plane travel is not at a mass-market scale (nor is it even certain that they will ever be able to).

      • plyth@feddit.org
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        5 days ago

        The costs of the platforms would significantly reduce the efficiency of the solar cells.

        My point is that planes have the advantage of not needing tracks which come with costs. There are the maintenance costs and the costs of not using them otherwise. We shouldn’t be surprised if trains can’t compete on many connections.

          • plyth@feddit.org
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            5 days ago

            The equivalent would be railway stations. In both cases the minimum is not much more than a roof.

        • GissaMittJobb@lemmy.ml
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          5 days ago

          The amortized savings of having the tracks outweigh any opportunity costs introduced by the tracks taking up space.

            • gian @lemmy.grys.it
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              5 days ago

              In France, airfrance stopped to fly some routes since they cannot make them cheaper than a TGV

              • plyth@feddit.org
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                5 days ago

                Of course there are connections where trains are more efficient. It’s just not all of them. An analysis should try to identify which connections should be cheaper but are not. Listing them all destroys any meaningful critique.

    • lime!@feddit.nu
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      5 days ago

      rail track is one of the worst places you can put solar panels. pressure differentials, oil spills, hot metal, and you can’t angle them which means they can never produce their peak efficiency.

      there is no reason to even consider ground-level solar until every rooftop and awning is covered.

      what are you trying to say?

      • plyth@feddit.org
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        5 days ago

        The idea is to put them there instead of tracks and let people fly instead. The numbers suggest that that would be a net benefit.

        • lime!@feddit.nu
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          5 days ago

          but is that taking into calculation that avgas is not taxed while electricity is? is it taking into account the relative efficiency numbers of turbofans? is it taking into account the cumulative amount of time lost sitting at airports, which is usually not counted into travel time?

          • plyth@feddit.org
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            5 days ago

            There are reasons to go by train. My point is that trains are not naturally more efficient. It takes cheap electricity and high volumes of passengers to make it profitable. Of course fair taxes help but prices weren’t part of my calculation. The energy used for tracks is already so big that many lines are better served by plane.

            • Justas🇱🇹@sh.itjust.works
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              5 days ago

              Can’t wait to send 400000 tons of pig iron by a plane. You are missing the cargo trains (that mostly use the same tracks and are rail company’s bread and butter) in your calculations.

              • plyth@feddit.org
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                5 days ago

                The comparison should use highspeed trains which have their own tracks.

    • Loui@feddit.org
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      5 days ago

      2 kWp means 2 kilo watt peak. It’s the maximum they can produce and in no way the average.

      • plyth@feddit.org
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        5 days ago

        You are right, I considered that.

        The average per year is calculated from that number by roughly multiplying with 10 in Europe. I have looked that up and not multiplied by hours in a year.

            • lime!@feddit.nu
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              5 days ago

              right, so that’s most likely optimal placement, with peak efficiency being reached for a little while each day as long as the weather is good. if they lie flat, you can lose as much as 90% of that energy, and that’s still with proper maintenance. flat panels also don’t self-clean, so maintenance would be even higher.

              basically, you can probably skip the multiplication altogether.

              • plyth@feddit.org
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                5 days ago

                It’s not the most optimal. It’s for a 20% panel slightly south of England:

                However, in Michigan, which receives only 1400 kWh/m2/year,[3] annual energy yield drops to 280 kWh for the same panel. At more northerly European latitudes, yields are significantly lower: 175 kWh annual energy yield in southern England under the same conditions

                https://en.m.wikipedia.org/wiki/Solar-cell_efficiency

    • banause@feddit.org
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      5 days ago

      See, studies are not there to show something is true. They are there to have a scientifically proven analysis as a base.

      It’s like when you are at work and everyone knows that meeting xy is inefficient. However, your boss still needs data and a slide deck to present hard facts to the management board.

    • lgsp@feddit.it@feddit.it
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      6 days ago

      I understand why you write this, but collecting data is the first step when you want to change something.

      Even if a femomenon sounds obvious, maybe it is not. Moreover the study analyses also why this happens, and it is pretty interesting.

    • BenchpressMuyDebil@szmer.info
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      6 days ago

      Which is cheaper:

      • lift 50 tons of metal off the ground burning 20,000 liters of fuel
      • make 50 tons of metal run over the ground using electricity

      How is this obvious?

    • Melchior@feddit.org
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      5 days ago

      For cross border routes only 45.9% were always cheaper by plane and for domestic ones only 15.2%.