For sure they could collapse society and cause a massive drop in the global population but extinction?

The state of vulnerability that these incidents cause in the population is very high.

Periodically, however, a severe winter will cause a major decline in the population.

Affordable housing in the area caused a dramatic spike in the population.

This caused a severe drop in the already sparse native population.

Absent from India for 30 years, it caused panic in both the local population and regional public health authorities.

The economic blockade of Republican controlled areas caused malnutrition in the civilian population.

By some accounts the violence has caused major shifts in the population of the area along sectarian lines.

They calculate that 21 bears can be killed by humans every year without causing a decline in the population.

The abundance of food has caused an explosion in the insect population in this area.