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Duncan - The Low Carbon Economy Ltd

14 Apr 2009 04:04:15

There are an estimated 600 million cars on the world's roads today

Between January and May, over 15 million cars have been manufactured worldwide.

In 2008, over 50 million cars were manufactured.

It's estimated that there are . Assuming an average exhaust pipe diameter of 1 inch (2.5cm), the combined area of exhaust pipes of cars on the road today can be estimated as:

1. Average area of one exhaust pipe: π(r*r) = 3.14 * (0.025cm^2) = 0.0019625 m2
2. Total number of cars = 600,000,000
3. Total number of cars * average area of one exhaust pipe = 600,000,000 * 0.0019625 = 1,177,500 m2

Now, a square kilometer is 10^6 m2, so a rough approximation of the total surface area of all the world's cars' exhaust pipes is 1.2 km2 (about the area of in London).

This whole concept of total amounts of things in the world really interests me. I think it's a powerful tool for helping people to visualise humanity's combined footprint on earth, and I'll try to find some other interesting stats and post them soon.

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