Other catastrophic risks include natural epidemics (the 1918-1919 Spanish influenza killed between 20 million and 40 million people), nuclear or biological attacks by terrorists, certain types of lab accidents, and abrupt global warming. The probability of catastrophes, whether intentional or not, resulting from human activity appears to be increasing because of the rapidity and direction of technological advances.
其他灾难性风险包括天然流行病（1918年到1919年的西班牙流感夺去大约2000万到4000万人的生命），恐怖分子发动核子或者生物攻击，某些种类的实验室事故以及突发的全球温室效应。由于技术进步的迅猛和方向，由人类有意或者无意活动引起的灾难可能性看起来在增加。