1) Computer applications have penetrated all areas of environmental protection in China and improved the overall level of environmental protection work. However, the rapid development of information technology has also brought some negative environmental impacts known as "IT pollution".
2) The document discusses several ways computers are used in environmental protection including environmental analysis, management, engineering, and education. However, it also notes the environmental issues caused by the growth of the computer industry in China, such as electronic waste and toxic materials.
3) While computers have benefits for environmental protection, China needs measures to reduce hazards from the computer industry through regulations, non-toxic materials, and recycling programs.