Earth has been around for about 4.6 billion years, and the planet has been through all kinds of changes during that time, from white-hot oceans of magma to a frozen coating of glaciers to diverse ecosystems filled with life.
Geologists can read the planet's history by looking at distinct signatures in its rock layers, and they mark each chapter with a meaningful title: Cambrian, Jurassic, Holocene, Pleistocene, just to name a few.
Today, scientists argue that we have started a new chapter in the story of Earth: the Anthropocene, and for the first time in the planet's history, one species is its primary author.
The animation below explains what scientists mean when they talk about the Anthropocene and why our actions in this "age of humans" matter for everyone's future.
You may not know precisely what the eras of the Earth are. Just what is the Anthropocene? It is viewed as the period during which human activity has been the dominant influence on climate and the environment.
As for the other eras, the Cambrian was the first geological period of the Paleozoic Era. It occurred 541 to 485.4 million years ago and is noted for its significant change in life on Earth with the introduction of more diverse life forms.
The Jurassic period occurred 201.3 to 145.5 million years ago. The Jurassic era makes up the middle period of the Mesozoic Era and often is known as the Age of Reptiles.
The Pleistocene era lasted about 2,588,000 to 11,700 years ago. The end of this era corresponds to the end of the last glacial period.
The Holocene era began after the Pleistocene era, around 11,700 years before A.D. 2000 and continues to the present. It is part of the Quaternary period. It includes the growth and impact of humans across the globe.