| Sumario: | The article focuses on most significant catastrophic risks like pandemics, asteroids and what can be done about them. A risk of natural catastrophe that cannot be blamed on technology to even the slightest degree is that of a collision between an asteroid or comet and the earth. Bioterrorism is a growing threat for several reasons; advances in biotechnology; the fact that effective measures against one type of terrorist threat, such as airplane hijacking, cause terrorists, who in this and other respects are quite rational.
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