Sentences of a paragraph are given below in jumbled order. Arrange the sentences in the right order to form a meaningful and coherent paragraph.
A. There are many secondary reasons as well along with increasing levels of carbon.
B. The term is used to describe the unnatural rise in earth’s average temperature.
C. Increased carbon dioxide is the primary driver of global warming.
D. Global warming is the single biggest threat to life on earth today. | 
