What an interesting question!
How much energy the train expends converting energy to motion
really seems moot in this scenario, as the train is running whether
you are on it or not. The extra energy the train might expend if you
were on it is beyond the scope of this question! :-) However, the
number of people riding the train is surely varied day to day, so we
really don?t need to worry about the amount of energy needed if you
were on the train. The train is running daily, whether or not you are
That said, if you are ON the train, and not putting off additional
CO2 from riding in a car, on a motorcycle or bicycle, you ARE ?saving?
CO2. Keep in mind you are putting off CO2 while ON the train too, but
a bit less and you are burning less energy sitting than pedalling a
Since this is not a true ?scientific? answer, I?ll go with the figure
I found on the link below- Humans exhale about 300 grams CO2 per
person per day
And this site:
PharmaciaRetirees put it in pounds: ?Humans exhale 2.2 pounds of CO2
per day or 803 pounds per year (over 1000 pounds per year for
For some reason British citizens give off more CO2, according to this
site. The site has some nice graphics on energy expended for walking,
A motorcycle gives off about 0.3 pounds of CO2 per mile, in addition
to what you exhale while riding it!
So, in comparing a bicycle to a motorbike, with normal activities,
you?d exhale about 2.2 pounds a day, a bit higher if you go by
bicycle. If you rode a motorcycle just 10 miles, you are adding an
additional 3 pounds of CO2 to the environment.
Therefore, far less CO2 is produced if you ride a bike versus a
motorcycle. Now, since the average human exhales about 803 pounds of
CO2 per year, and a jogger puts off about 1000 pounds a year, let?s
put a bicycle rider at about 900 pounds a year. Riding a motorcycle
will add 900 pounds of CO2 after riding just 3,000 miles, in addition
to the 803 pounds a year you add just by being. Any motorcycle riding
will increase CO2 output.
A train/subway gives off about 0.6 pounds of CO2 per mile, while a bus
puts out about 0.7 pounds of CO2 per mile, according to the Delta Land
You will add a bit less CO2 to the air by riding the train, since it
is running anyway. Riding a bicycle to and from the train station
instead of in a car, releases far fewer greenhouse gasses and you get
the health benefit of the exercise! A bicycle will add far less than a
motorcycle. All of these will add far less than a single passenger in
I don?t know if you were referring or a motorcycle or a bicycle in the
question. There are benefits to your health and wallet if you ride a
bicycle, especially if you DON?T ride along a busy highway, where you
will breathe in more pollutants like CO (Carbon monoxide).
Some useful sites:
?Surprise! The answer to the first question is the bicycle. The
bicycle is the most efficient way to get around Walking, skate
boarding, roller blading or riding an animal takes more energy, in the
form of food, than peddling a bicycle. As noted in the graph below,
the next most efficient ways to get around are to share a ride with
others in a van, train, bus, or car. The most common way Americans get
around, however, is in a car or truck with only one person in it and
this is the least efficient and least environmentally sound way of
getting around, second only to the airplane.?
?Walking, biking, mass transit, and new car sharing options, NEVs,
e-bikes, and motorcycles could improve our quality of life, by slowing
down our pace and reducing road congestion and emissions from
?A round trip of 1600 kms, (London to the South of France) by car with
the bike on the roof, creates 360 kg of CO2, the main greenhouse gas.
If you go by train and hire a bike when you arrive, you'll create 100
kg of CO2. If you go by plane, with your bike in the hold, you'll
generate a whopping 850 kg per person, which is more than the amount
produced by heating an average size house for a year! Estimates of the
contribution airplanes make to global warming are up to 15% and
rising. To arrest the acceleration of global warming it is accepted
that the West (that's you, my friend) must cut CO2 output by 80%.?
?Carbon monoxide (CO) -- A colorless, odorless, poisonous gas,
produced by incomplete burning of carbon-based fuels. including
gasoline, oil, and wood. Carbon monoxide is also produced from
incomplete combustion of many natural and synthetic products. For
instance, cigarette smoke contains carbon monoxide. When carbon
monoxide gets into the body, the carbon monoxide combines with
chemicals in the blood and prevents the blood from bringing oxygen to
cells, tissues, and organs. The body's parts need oxygen for energy,
so high-level exposures to carbon monoxide can cause serious health
effects. Massive exposures to CO can cause death. Symptoms of exposure
to carbon monoxide can include vision problems, reduced alertness, and
general reduction in mental and physical functions. Carbon monoxide
exposures are especially harmful to people with heart, lung, and
circulatory system diseases.?
?Carbon Dioxide (CO2) -- A colorless, odorless, gas that occurs
naturally in the earth's atmosphere. Significant quantities are also
emitted into the air by fossil fuel combustion. Emissions of CO2 have
been implicated with increasing the greenhouse effect.?
?Looking ahead, carbon dioxide emissions from transportation sources
in the United States are projected to grow at an average annual rate
of 1.8 percent between now and 2020. This compares to an overall
increase in CO2 emissions in the U.S. of 1.4 percent per year, meaning
emissions from transportation will become an even larger part of the
problem in the years ahead. This continuing growth will result from
projected increases in vehicle-miles traveled-translated, this means
more cars driving greater distances-as well as growth in freight
shipments and air travel.?
?Carbon dioxide (CO2) emissions from the consumption of gasoline,
diesel, and other fossil fuels are the principal cause of global
warming, which brings health and economic risks from climate change.?
Auto vs. Bike
About the CO2 we exhale:
I hope this has answered your question. If not, or if any part of my
answer is unclear, please request an Answer Clarification, before
Greenhouse gasses + train + bike + motocycle
Carbon dioxide output vehicles