Some folks will argue that cats themselves are not sustainable due to their propensity to kill off small song birds. The mining of clay for cat litter has had a devastating effect on the environment.
Nevertheless just as there is appropriate design for humans there is appropriate design for cats which takes into account their need for height, safety and easy climbing throughout their lives.
The most famous cat centric home is the "Cat's House" which is a otherwise unremarkable suburban ranch home in California. A more modernist approach to a cat lifestyle is Asahi Kasei’s Plus-Nyan house.
You can find pictures of it on Apartment Therapy and Crooked Brains.