The sumerians took an important step in changing their physical environment?

The Sumerians significantly transformed their physical environment through the development of advanced irrigation systems. By constructing canals and levees, they effectively managed the waters of the Tigris and Euphrates rivers, facilitating agriculture in the arid landscape. This innovation allowed for increased crop yields and supported the growth of city-states, laying the foundation for their complex society and culture. Their ability to manipulate and enhance their environment was crucial for sustaining their population and economic prosperity.