Re-evaluate

For the impending production and consumption,we should first decide on its necessity and impact on the environment before acting.If necessary,we should figure out how to produce or consume most economically,namely,using the least energy and emitting the least carbon dioxide.

Re-duce

For the necessary production and consumption,effort should go into the least energy exploitation.

Used items should be repeatedly exploited to increase their utilization rate.

Re-cycle

Ways should be worked out to recycle used products to promote the energy utilization rate.

Re-newable

Utilize more renewable resources,for example,plant resources,solar energy and wind power.Lessen reliance on non-renewable resources such as oil.

Sustainability

Sustainable development is concept which is simple but of great significance to the future of our society.In 1987,the United Nations Brundtland Commission defined it in Our Common Future:"sustainable development refers to the development that can meet the needs of the current generation while not threatening the later generation`s ability to meet their needs".