The widespread adoption of a green lifestyle is a necessary precondition and means for the successful transition towards sustainable development. Environmentally sustainable consumption is an important component of a green lifestyle. Clarifying the concept of “sustainable consumption” is significant for its advocacy. “Consumption” refers both to the act of using something and to the act of obtaining something by means of exchange. Under the condition of ecological finitude，each individual ought not only to exercise restraint when buying things，but also to make thorough and careful use of whatever that possesses value. This is the only way in which to ensure that the basic needs of all are met under resource constraints. Knowing when enough is enough，and learning to be content with sufficiency are the foundational values on which the practice of sustainable consumption and a green lifestyle is based.