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until the 1920's Food was delivered by sailing vessels
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Until refrigerated cargo vessel, the only foods shipped were dry goods that had long self lives. Fresh meat and Vegtables could only be shipped short distances. even then, the rate of spoilage could often be higher then the rate of deliver goods. Scurvy and other vitamin deficency diseases were a regular ocurance in northern areas.
As to the Obama campain. What your seeing is the largest group of uninformed voters ever in the history of America going to the polls. People who don't really know what life was like before modern times. Simple things like having a tomato on your burger in december, didn't exist. Being able to drink water from the tap, could have killed you.
You might want to read a little about life prior to human figuring out that oil can be used for more then just pouring it on your enemies. As to us destoying the planet, a bit more history on the subject would do you good. Volcanic eruptions that blacken the sky for years, Massive floods that strip everything in there path, forrest fires that burn areas bigger then states. Mother nature isn't the sweety you've been led to believe. We're in more danger from forces beyond our control, asteroids, earthquakes, volcanos, tsunomies, solar forces, antimatter, supernovas, and crap that we don't even know about yet, but can probably kill us all is the conditions are right.