By the early twentieth century, carbon emissions from fossil-fuel burning reached 1 billion tons a year. automobiles, airplanes, and domestic and agricultural energy demands all contributed to the rising trend. in the 1950s, scientists used a new generation of equipment to confirm that carbon-dioxide concentrations were doubling and that this would have the effect of increased temperatures.
what chronology is described in this excerpt?
a. the increase in automobile usage from the early twentieth century through the 1950s
b. the changes in carbon dioxide emissions from the early twentieth century through the 1950s
c. the development of new technologies from the early twentieth century through the 1950s
d. the changes in popular modes of transportation from the early twentieth century through the 1950s

The correct answer is B. The changes in carbon dioxide emissions from the early twentieth century through the 1950s

Explanation:

The word chronology refers to the way events occur according to time or the way an event evolves during the time. In the excerpt presented the author describes by the beginning of the 20th-century carbon emission were about "1 billion tons a year". But by the 1950s scientists found the emission of this substance had double, which is explained by the author as the result of higher energy demands. This means in this excerpt the author main purpose is to explain the way carbon-dioxide emissions increased during the time and therefore the chronology described is "The changes in carbon dioxide emissions from the early twentieth century through the 1950s".

d

explanation:

plagiarism can get you expelled from your course, and college, or university. plagiarism can result in legal action like fines and penalties etc.