If you are short-sighted, you cannot see things properly when they are far away, because there is something wrong with your eyes.
If someone is shortsighted about something, or if their ideas are shortsighted, they do not make proper or careful judgments about the future.
Environmentalists fear that this is a shortsighted approach to the problem of global warming.
环境保护主义者们担心这并非解决全球变暖问题的长久之计。