Abstract: It is important for scientists to use terms with the same meaning in academic exchange. However, the understanding and usage of the terms in climate change science are incompatible between researchers and different policy-makers, leading to some problems both in science and actions to cope with the global issue. Here a brief discussion is held about explicit and implicit meanings of quite a few frequently used terms in literature. The purpose of my humble opinion is to arouse a keen interest from the scientific community in order to find a final solution for the issue by provoking a further discussion. In particular, the terms discussed in this paper include climate change, climate variability, global warming, global change, global climate change, abrupt climate change, climate change monitoring, climate change detection, climate change attribution, and climate change projection.