1.1. Introduction The development of human society makes a change of environment to satisfy their needs. It produces consequently destructive effects to the environment. In the reverse direction, environmental changes affect human being deeply, such as forest destroyed, the global warming, etc. It is the ring alarm about World Environment which is in danger nowadays. The importance of environmental protection was realized and mentioned many years ago. In November 11th, 1997, Kyoto Protocol[1] of reducing Greenhouse was agreed, covers more than 170 countries in practical actions. According to Word Resources Institute, over 10000 non-governmental organizations which work in environment preserving field were established up to first decade of 21th century. Regardless all protective activities, the global environment is getting worse, because the efforts to fight for environmental protection is too small while the world’s population is raising up very rapidly. People with their activities such as consuming, producing, building and so on harm the environment daily. Unfortunately, almost of them ignore or do not realize it. The perceptive ones do not know the best way to share with others, to react for better place. Modern technologies with their innovative products such as Internet, World Wide Web and Mobile Phone are powerful tools which can help to solve all problems above. GreenPeace is an instance of these solutions, a web-based system for community to incorporate to monitor and notify all environments problems to government and corresponding offices. With GIS built in, it is the open information channel for all of people to join in monitoring environment. In next chapters, we will explain in details the structure and works of GreenPeace. 1.2. Our approach This web-based application changes the way people get and share environmental information, in which users can submit or get environmental information about every place all over the world with the use of modern communication technologies such as Internet and mobile network. An exciting looked, GIS-based digital map Virtual Earth empowered with productive database platform SQL Server, and comprehensive data communication component Windows Communication Foundation, allows information to be updated immediately, visually and easily. In case of emergency, the processing speed of GreenPeace is a key factor which helps people, Government and related organization together react sudden environmental problems efficiently. On the other hands, GreenPeace also supports people in notifying environmental hazards as well as in searching not only the information but also the solution for problems from professional resources. Every individual can contribute effort to react environmental events happening around us. By making a social network, GreenPeace improves the quantity and quality of members who take part in protecting environment campaign. People will raise their perception and skills from other friends, they also can help others. In summary, GreenPeace supplies users a virtual visual environment to preserve, lead to help people protect their live environment. 1.3. Thesis structure The rest of this thesis is organized as below: Chapter 2: gives an overview of web based system. Chapter 3: introduces the web-based GIS Virtual Earth. Chapter 4: presents the GreenPeace system with system architecture and implementation. Chapter 5: demonstrate GreenPeace system with use cases. Chapter 6: gives a summary and objectives in the future.