Rainwater is saved and used to water the lawn.
And in some units, bathwater is reused as toilet water. Welcome to green living. Good ventilation and the use of non-toxic materials improves air quality inside the building. Green buildings can benefit our wallets too, says environmentalist John Bennett. Certain insulating and heat-retention procedures can slash a tenant or homeowner's heating bill, says Bennett, an energy specialist with the Sierra Club of Canada, an environmental group.