In terms of reference, it is correct to affirm that

a

“It” (line 9) refers to “rise” (line 7).

b

“Which” (line 14) refers to “threats” (line 11).

c

“Whose” (line 48) refers to “Jeffrey Sachs” (line 46).

d

“Them” (line 55) refers to “emissions” (line 54).

e

“Its” (line 60) refers to “time” (line 60).

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