Would commuting on a horse be more eco-friendly? What if there were millions of people did that? Would millions of horses be better than millions of cars?

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    For distances that you're willing to do by horse, I think a bicycle would be more sustainable. And will probably get you there faster -- even at a moderate trot, a horse is going to travel around 12mph, a speed that most commuters can maintain (excluding waits for traffic lights and long steep hills). – Johnny Jul 13 '15 at 23:50
  • @Johnny: Of course you need to factor in the eco-costs of road maintenance, which is pretty important for maintaining a decent speed on a bike. – PJTraill Nov 6 '18 at 17:20

In large numbers, horses are more problematic than cars.

According to Eric Morris, in 1898 delegates from around the world gathered to discuss urban planning. The issue they were "desperate" to solve was what to do about horse manure.

Rutgers University has a fact sheet about horses and manure. It states that a 1000 lb horse will produce about 9.1 tons of manure a year. Additionally, each horse needs about 10 to 20 pounds of bedding each day. If you assume 15 pounds of bedding per day on average, that's 2.7 tons per year. Combine this with the amount of manure each horse produces and it's 11.8 tons of waste each year. This excludes horse urine not absorbed by bedding which adds a further waste burden to the environment.

One million horses will produce 11.8 million tons of solid waste each year. Disposing of that is a massive environmental problem and why the delegates to the 1898 conference in New York were desperate about the waste produced by horses. With so much manure to dispose, it ground water can easily become contaminated.

Additional problems produced by horses are what to do with the numerous quantities of horses that will die each year.

The removal of horses from urban environments has resulted in one of the major improvements in human health. The permanent removal of horse manure from urban environments has significantly reduced the amount of disease carrying flies in cities and towns. Also, people in cities and towns no longer have to deal with smell of horse manure and urine or avoid having to step in horse manure or urine as they walk around town.

The other aspect of horse manure is that horses need to eat. According the Eric Morris, each horse needs about 1.4 tons of oats and 2.4 tons of hay each year. That's 3.6 tons of food each year. Rutger's University uses a figure of 25 pounds of dry feed per horse each day; that's 4.56 tons per year. Growing that much food for horses will require a lot of land.

  • The problem here is not the cars or horses, but commuting, and fundamentally the urbanism. Collect too many of any species, including (or perhaps especially) humans, in too small a space and you create problems. Keep a couple of horses in your pasture, letting them graze, and there's no problem at all. You also don't need to feed oats, and in fact can cause health problems from too rich a diet. – jamesqf Jul 10 '15 at 18:14

I think the main problem is that commuting is almost never "eco-friendly". There's a lot of energy that's needed to carry your behind (and your carriage) from your home to your workplace.

I think the most efficient way to commute it is to use public transport, for which the weight-of-vehicle to weight-of-passenger ratio is lowest. For trains, the amount of friction is also reduced to a minimum.

Horses have high friction, they need a lot of rest, and they keep "running" (i.e. breathing, eating, etc.) even if they're not carrying anything.

I think it is a partial misconception that horses are a good method of transport. In old Asia, messages were sometimes delivered by "marathon monks", messengers who were running on foot because they turned out to be faster than conventional horse-riding messengers, because they could run for longer and needed not as much rest. Horses overheat much easier than humans. In fact, there are tribes in Africa to this day, who hunt (in groups of three) by running behind antelopes until the antelope collapses from exhaustion. (And that's without anyone riding the antelope.)

So, if anyone should run you back and forth between your home and your workplace, it should be you. (I guess the distance and the size of your briefcase is a limiting factor here.) =)

  • I doubt that the weight ratio is that good, trains are damn heavy. en.wikipedia.org/wiki/DBAG_Class_612 as a quite current example for suburban commuting train: 119 tons, 122+24 passengers, so more than 800 kg per passenger! If you carpool and dont use your 5000 lb Humvee to commute this could be beaten by cars. Obviously that ratio is bound to be much better for "real" metropolitan rapid transportation, take en.wikipedia.org/wiki/MF_01 same weight as above and capacity over 550 passengers. Ok, that's hard to beat other than by bicycle or rickshaw ;) – Ghanima Jul 10 '15 at 21:53
  • @Earthliŋ: Antelopes are not horses. And from personal experience, while it's pretty doable to keep pace with a trotting horse, one at a canter or gallop will leave you in the dust. – jamesqf Jul 10 '15 at 22:01
  • @jamesqf What I said was only intended to give a different perspective and wasn't intended to be taken too seriously. Of course antelopes, too, will leave you in the dust at a running speed of about 55 mph. My point was that humans aren't so bad long distance runners. In fact, over a marathon distance the better runners (2.5 hs) would just about tie with a horse and that's without the horse carrying anything. And if we're talking short distances, the most sustainable solution would be to walk or ride a bicycle anyway, no need for horses. – Earthliŋ Jul 10 '15 at 23:11
  • @Ghanima I'm not claiming trains are worth it for every area, but Tokyo subway trains have a (possible) ratio of 200 kg (less for newer trains) per passenger and trains are often full or otherwise overfull. (Maybe not between 10-12 in the morning.) That's hard to beat with a car, even before thinking about traffic lights etc. – Earthliŋ Jul 10 '15 at 23:34
  • Dear @Earthliŋ, in the end I came to the same conclusion, thus +1 ;) – Ghanima Jul 11 '15 at 8:12

Horse manure is not an environmental nuisance, unless pathogens are present. Properly recycled.......Manure is fertilizer, just work it into your soil. Or sell it enter image description here

It's a battle of arguments. Horses need food, cars need fuel. Where as the impact of human machine assisted locomotion is Far less environmentally harmful and vastly more efficient. A 150 lb person riding a bike at a steady pace of 14 miles per hour will burn 48 calories. At steady pace will arrive at his destination of about 4.2 miles every minute. It means he cant transit himself the distance of nearly 5 miles with the metabolic energy requirements of eating one candy bar.

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