Environmental responsibility of corporations has been changed drastically in the last 20 years. In 1980s, pollution prevention was the main mandate for corporations and in 1990s global scale environmental issues such as global warming must be also considered by at least industries. In the year of 2000, United Nations decided to make a challenge towards sustainability of human activities on the Earth, and since then, every corporation must take this concept into account when policy for its own business is described. Within this framework, some companies have succeeded to be evaluated as “environmental conscious companies” and enjoyed success also in their business. The reality of sustainability is very complex and any company must consider rather long future, say more than 30 years, in the strategy of its operation. All engineers should watch the direction and the norm carefully, which their own company is now aiming at, with enough knowledge regarding the trend of total human activities in relation to the limitation of the Earth.