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> Why don't they just eject those chemical weapons into outer space?

What if it falls back to Earth?

burned upon reentry

What if the rocket fails before it gets to space, and falls back to Earth?

Or if it explodes in the atmosphere, scattering chemical weapons (some of which will remain unburnt) throughout the atmosphere.

I wonder if a space elevator will ever be viable...

Is a space elevator a fantasy? Have people given up on it?

Fountains of Paradise by Arthur C. Clarke is a great book about space elevators.

> What if the rocket fails before it gets to space, and falls back to Earth?

Excellent point, there are many things that could go wrong in the short time to low Earth orbit.

Not only that, it is incredibly expensive.