Kerrie said:
intelligence is the ability to utilize what one already has. to compare our abilities to a bat is to compare car to a bicycle. each are modes of transportation, but is one better then the other? only in specific instances. a car is much better at long distance travel, however a bike is much better at not polluting our environment and lower maintenance.
Just for fun, I looked into this matter a bit. I ran some calculations and figured out that if I used a mountain bike on flat terrain, I would burn about 98 calories (actually, kcal, but calories is the commons designation) per mile riding at 15 mph. So I imagined a 60 mile trip on flat even terrain, taken three times a week for one year. I could either ride the bike or take a car. My car gets about 30 mpg, so it would use up 2 gallons of gasoline on such a trip.
If I took the bike, I would burn a total of 5882 calories on one trip. If I took the car, it would burn 62,000 calories (the amount of calories in 2 gallons of gasoline). So certainly the bike is more fuel efficient. Let's look at the cost, however.
If I take the trip 3 times a year for one year (or if you want, if I commute a total of 180 miles per week) then I will have used up 312 gallons of gasoline by taking the car. At $2.25 per gallon, which is the low price you can find in the LA area, I will have spent $702 on fuel.
If I take the bike, I will require 5882 calories every time I take the trip. Let's assume I am a healthy vegetarian and I eat only wheat bran to prepare for my trips. Wheat bran gives an average of 70.31 calories per ounce, so I will require 84 ounces each trip. By taking the 3 times a week for one year (or 156 times), I will require a total of 13,104 ounces of wheat bran for the year. If I buy pure wheat barn from
www.pricegrabber.com I can get it for $0.99 per 12 oz. This way, my total fuel costs for the year will $1,092 dollars. So I can save $390 each year by taking the car rather than the bike.
Now let's look at the time it takes. Given open highway on flat terrain, I can move at about 60 mph in the car, so the trip will take exactly one hour each time. Taking the trip 3 times a week for one year, I end up spending 156 hours in the car each year, or 6.5 days. I calculated the calorie expense on the bike at 15 mph, and at that pace, the trip will take me 4 hours. Multiplied out, I will spend a total of 624 hours on the bike each year, or 26 days. This is an additional 468 hours each year, or 19.5 days.
So in conclusion, although the bike is more fuel efficient, it is grossly less cost-efficient. Assuming you make $25,000 per year, which is an average starting salary out of college, your time is worth $12 an hour. So not only do you lose $390 directly by taking the bike, but you also lose $5616 of your time, for a grand deficit of $6006.
In case anyone is curious, you would also eat up about 1 bushel of wheat each year in order to get that much grain. An average acre of farmland in the state of Georgia yields about 40 bushels of wheat each year, so you would use up 1/40 of an acre. I don't know what the ecological impact of this is versus the impact of producing 312 gallons of gasoline. One barrel of crude oil produces about 19.5 gallons of gasoline, so you would use up 16 barrels by taking the car each year. In terms of pollution, 1 gallon of gasoline produces about 18.5 lbs of carbon dioxide, so taking the car would release 5780 lbs of carbon dioxide into the air over the course of the year. About 130 lbs of fertilizer is used per acre of farmland and 2.2 lbs of pesticide, so by consuming 1/40 of an acre, you would be contributing 0.055 lbs of pesticide and 3.25 lbs of fertilizer to groundwater pollution, which contributes to the eutrophication and destruction of streams, estuaries, and lakes. Producing that much fertilizer also releases a total of 1.66 lbs of gaseous pollutants into the air, which is pretty negligible.
So although the monetary cost of taking the bike is much greater than the cost of taking the car, the ecological cost of taking the car is much greater than taking the bike.