The phrases “Buy one, get one free,” “Kill two birds with one stone” and “It’s a two-fer” are part of our everyday language. How do these common phrases relate to sustainability? Virtually all of the strategies that promote sustainability have more than one benefit — also referred to as cobenefits.In many cases, they provide much more than just a “two-fer.” Sustainability strategies save money, conserve resources for future generations, improve public health, respond to climate change and make communities more attractive places to live.