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Analysis Says Planes Might Be Greener Than Trains
New Scientist has an interesting piece up about the calculable energy costs per mile for various forms of transportation. Despite the headline ("Train can be worse for climate than plane"), the study it describes deals with highway-based vehicles, too: the authors attempted to integrate not just the cost at the tailpipe (or equivalent) for each mode of transport, but also the costs of developing and supporting the associated infrastructure, such as rails, highways and airports. Such comparisons are tricky, though; a few years back, a widely circulated report claimed that the Toyota Prius had a higher per-mile lifetime cost than the Hummer (see that earlier Slashdot post for good reason to be skeptical of the methodology and conclusions). I wonder how the present comparison would be affected by a calculation of (for instance) how much it would cost to move by plane the freight currently carried by trains.
As someone who has read the report (instead of just read articles which summarized it) I can definitively say that that report was, is, and always will be a load of crap.
First off, that report came from a marketing firm, not a serious research organization. Since when are marketing firms experts on lifetime costs.
Secondly, their estimates were that the bulk of the energy costs for each of these cars was in the cost of recycling and/or disposing of the cars. Specifically, for the Prius, a $20,000 car, they estimated that it would take over $100,000 worth of energy to recycle or dispose of it.
Right off, that doesn't pass the simple common-sense test. If it costs $100,000 to recycle or dispose of a Prius, then who is going to be paying that? For all of the cars on the road, they estimated that disposal and/or recycling would cost at least tens of thousands of dollars. Which is to say, if the report is to be believed, scrap yards are all operating at gargantuan loses, since, generally most of them will pay you for your car rather than charge you to haul it away.
My best guess as to the justification of their lunacy is that they're assuming that all of the plastics in a vehicle will be somehow incinerated at some huge temperature or something (rather than simply put in a landfill, which costs way less energy) and they've slipped a digit or two somewhere. But in the end, it's impossible to judge because although they claim to have some very specific break-downs which justify their numbers for each category of the life-cycle, those break-downs are only available if you spend several thousand dollars to purchase the complete version of the report from them.
Is ERL for real? Is it customary nowadays for journals to charge $1900 to to publish an article?
The market will tell you what is the correct cost ...
Presuming an efficient market. With all the components that go into a cost as being correctly priced, with no market distortions, such as subsidies.
As it is, we don't have a flat and fair market. Farmers get subsidies, energy users don't pay the full price for their CO2 emissions and road / rail users don't pay the going rate for infrastructure access (incl. maintenance costs).
politicians are like babies' nappies: they should both be changed regularly and for the same reasons
All interesting points, but there's always the example of Havana, Cuba, where 70% of the food eaten in that city was actually grown in that city. That's got to be an attainable goal here as well. As for heating and air conditioning, we've got a lot to learn from the buildings built before the industrial craze, and plenty of new ideas as well. Check it out. I have the privilege of spending my days in a LEED Platinum building, and let me tell you, this green building thing is going to take off when people realize how comfortable they can be.
As someone who used to glide, I know a little bit about this kind of cloud formation. When you see a single cloud in a relatively cloudless sky, it typically means that the cloud is perched on top of a thermal (when you are gliding, you keep a close eye on these clouds, because you ride the thermals for lift). The airport is almost certainly producing more heat than the ground around it, which will create a thermal directly above it. Water droplets in the air are pulled into this and collect at the top, causing a cloud. This doesn't necessarily have any connection to emissions; heat any other large patch of ground and you will see the same phenomenon. Often, just a large patch of black ground (e.g. an unused car park) will have the same effect if the sun is bright enough.
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