Final answer:
Global population levels have experienced explosive growth throughout much of human history, primarily during the Industrial Revolution and the 20th century.
Step-by-step explanation:
In human history, global population levels have experienced various patterns. Rather than declining every year or remaining stable, the most prominent trends have been explosive growth and dramatic fluctuations. For the majority of history, population growth was relatively slow, but it began to accelerate rapidly during the Industrial Revolution. This exponential growth continued into the 20th century, but has now started to slow down due to declining fertility rates in many regions.
Learn more about Global population levels throughout history