Climate change means the changes in climate. (a) — climate on earth is constantly changing. (b) — climate change, the weather pattern in any specific region on earth prevails (c) — across the whole earth is changing. Human activities are greatly responsible for it. We are cutting down trees for habitation and agricultural purpose. (d) — use of chemicals in industries causes serious harm to the ozone layer. (e) — there is a rapid increase in temperature causing greenhouse effect the ozone layer a purpose.