In this section, each item consists of six sentences of a passage. The first and sixth sentences are marked as S1 and S6. The middle four sentences in each have been jumbled up and labelled as P, Q, R and S. This is followed by four options each suggesting a sequence of the sentences. Identify the most appropriate option. S1: Consider the potential effect of just a small increase in the earth’s atmospheric temperature. S6: If the sea level rose only a few feet, dozens of coastal cities would be destroyed and life would change utterly. P: Some deserts might anyway bloom. Q: But lands now fertile might turn to deserts, and many hot climates could become uninhabitable. R: A rise of only a few degrees could melt the polar ice caps and submerge the planet in a short time. S: Rainfall patterns would change. The correct sequence should be