Let me be quite clear that the Earth will not be destroyed, and there will be no mass deaths that will decimate the population.

让我很清楚，地球不会被销毁，不会有大规模的死亡，将毁灭的人口。

youdao

The pollution could decimate the river's thriving population of kingfishers.

污染可能大量毁灭在这条河茁壮成长的翠鸟群。

《柯林斯英汉双解大词典》

It is a place where political prisoners languish in gulags, escaped defectors testify of cannibalism, and famines decimate the population.

CNN: Don't be fooled by Dennis Rodman's trip to North Korea

And, while most introductions of species be they rabbits or viruses to new environments fail, it only takes one success to decimate the local population of vegetables.

ECONOMIST: Pigged out