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It is ironic that bacteria and even smaller viruses can appear, invade, replicate and spread. Not only spread in a body, but spread from one body to another. Spread from one location to another. Be carried from building to building. Town to town. Country to country. Become a global pandemic. A tiny virus so small a microscope cannot resolve it.
The invention of the electron microscopes gave us a view of these tiny objects. The smallness of viruses makes them more easily moved and harder to control. Polio, Ebola and Flu need a human body to replicate. They also need large populations to become an outbreak, epidemic or pandemic.
Viruses show us that efficiency and replication are a basic life force. And uncontrolled can damage or kill the host. Are we a virus on the planet? Probably. Will the host survive? Definitely yes. Will the host be disfigured and crippled? Also yes.
It’s a fact that humans in small numbers could exist on the planet without destroying it. It was probably the invention of industrial agriculture that has allowed unchecked human overpopulation. So it is farmers that should be blamed for the destruction of the planet’s eco system. (Sarcasm intended)
It sad to think that we destroy the very thing that gave us life. Interplanetary space travel would only spread the human race like a virus infecting another host.