Reply #10: Interesting [View All]

[Richard D]

I've always found that civilization can easily be compared to cancer in the way that it spreads. It started out in just a couple locations, then started to spread. The cities got bigger and bigger by taking over and killing the surrounding nature, something cancer does to it's host as well. Parts of the cities broke off and then started cities in other locations that continued to spread and break off and so on. Sort of like cancer metastasizing.

It's a really clear picture when you look at the planet from the air, especially in areas where new development is occurring.