Environment around 4 million BC

The Globe

 

Africa

After a major cooling five to six million years ago, when changes in earth's orbit affected global climate, subtropical Africa's warm, moist environment was subject to oscillating cycles of cool, dry and warm, wet weather. Forested areas which proliferated in warm cycles, receded in cool cycles, allowing grasslands to take over until the climate shifted and woodlands returned. The cycles were relatively brief and mild, and had little effect on the evolution of animal species.(Patrerns in Prehistory)

Southwest Asia

 

Egypt

 

Indus Valley

 

China

 

Europe

 

South America

 

Mesoamerica

 

North America

 

Other