Green Design basic theory

Green design is more like sustainable design, envrionmental design or ecological design which is the philosophy of designing physical objects, the built environment, and services to comply with the principles of social, economic,and ecological sustainability.
The intention of sustainable design is to "eliminate negative environmental impact completely through skillful, sensitive design".⁽¹⁾ It is aim to reduce the poluution of the environment.
Sustainable design principles
While the practical application varies among disciplines, some common principles are as follows:

• Low-impact materials: choose non-toxic, sustainably produced or recycled materials which require little energy to process
• Energy efficiency: use manufacturing processes and produce products which require less energy
• Quality and durability: longer-lasting and better-functioning products will have to be replaced less frequently, reducing the impacts of producing replacements
• Design for reuse and recycling: "Products, processes, and systems should be designed for performance in a commercial 'afterlife'."^[2]
• Design Impact Measures for total carbon footprint and life-cycle assessment for any resource used are increasingly required and available. Many are complex, but some give quick and accurate whole-earth estimates of impacts. One measure estimates any spending as consuming an average economic share of global energy use of 8,000 BTU (8,400 kJ) per dollar and producing CO2 at the average rate of 0.57 kg of CO2 per dollar (1995 dollars US) from DOE figures.^[3]
• Sustainable Design Standards and project design guides are also increasingly available and are vigorously being developed by a wide array of private organizations and individuals. There is also a large body of new methods emerging from the rapid development of what has become known as 'sustainability science' promoted by a wide variety of educational and governmental institutions.
• Biomimicry: "redesigning industrial systems on biological lines ... enabling the constant reuse of materials in continuous closed cycles..."^[4]
• Service substitution: shifting the mode of consumption from personal ownership of products to provision of services which provide similar functions, e.g., from a private automobile to a carsharing service. Such a system promotes minimal resource use per unit of consumption (e.g., per trip driven).^[5]
• Renewability: materials should come from nearby (local or bioregional), sustainably managed renewable sources that can be composted when their usefulness has been exhausted.
• Robust eco-design: robust design principles are applied to the design of a pollution sources).

      (All of this principles are from Wikipedia.)

1. McLennan, J. F. (2004), The Philosophy of Sustainable Design
2. Anastas, P. L. and Zimmerman, J. B. (2003). "Through the 12 principles of green engineering". Environmental Science and Technology. March 1. 95-101A.
3. US DOE 20 yr Global Product & Energy Study.
4.  Paul Hawken, Amory B. Lovins, and L. Hunter Lovins (1999). Natural Capitalism: Creating the Next Industrial Revolution. Little, Brown.
5. Ryan, Chris (2006). "Dematerializing Consumption through Service Substitution is a Design Challenge". Journal of Industrial Ecology. 4(1)