s3a city problems and solutuons

energy from the sun 

Type of software that can process information on its own without human intervention. (smart Robot or computer)

the development of agricultural ecosystems intended to be sustainable and self-sufficient. 

an imagined place or state of things in which everything is perfect

The manufacture of goods in factories.

The use of Earth's renewable and nonrenewable natural resources in ways that are environmentally friendly 

able to produce enough for one's own needs 

to use again

electricity produced by flowing water