Major decline in human population?

Question

When did the only recorded major decline in the human population occur and why? I need this for biology tomorrow, so PLEASE help!

Answer 1

Noah's Ark  

Answer 2

I believe you are referring to the Black Plague, a pandemic that struck Europe and Asia in the 14th century.

The plague began in central Asia around 1340 and killed ~100 million people by 1400. In Europe 30% to 60% of the population was killed.

The cause is believed to be Yersinia pestis (aka Bubonic plague), but uncontaminated samples from that time are not available to confirm this.  

Answer 3

Yeah its the Bubonic Plague.  you can see it a big decline around the 1300's on this graph.

Answer 4

Uh, possibly when the bubonic plague was all over Europe?

Mid-14th century

Other name: Black Death