Consider instead something other than a lawn. They don't call it "green concrete" for nothing.
https://earther.gizmodo.com/lawns-are-an-ecological-disaster...
https://earther.gizmodo.com/lawns-are-an-ecological-disaster...
Lawns in general are green by being carbon sinks. But as with all things, it depends. If you live in the midwest with plenty of summer rain, the lawn costs very little. If you're in Arizona or California, water use is an issue.