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Even if all the plants and animals die, there is still an atmosphere, magnetic field, liquid water.

What will you and your 7 billion fellow humans eat if all of the plants and animals die? Why do you think that conditions which would be deadly to nearly all other life on this planet won't be deadly to you?

If you're making the point that life will find a way given Earth's strong life-supporting traits, I completely agree. But it won't be human life.

What are you planning to eat on Mars?

Sigh...this conversation is pointless.

I think he may be taking the human-survival-apathetic stance similar to this George Carlin bit, "The planet is fine; the people are fucked."

Not that I defend that viewpoint, but I can see its merits.

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