Population researcher, PE (Paul Ehrlich) for example, wrote a 1968 book called the Population Bomb. He predicted that population growth would call (cause) wide spread harm to the plant (planet).

• 比如，人口研究学家保罗E写了一本1968的书叫“人口炸弹”。他预言人口增长将对星球造成广泛的危害。