Following is the primary cause of a 20% increase in nitrous oxide emissions over the past 275 years.
a. cattle belching
b. increased use of nitrogen fertilizers
c. automobile exhausts
d. nitrogen fertilizer use
e. release from oceans
Answer: D
Following is the primary cause of a 20% increase in nitrous oxide emissions over the past 275 years.
a. cattle belching
b. increased use of nitrogen fertilizers
c. automobile exhausts
d. nitrogen fertilizer use
e. release from oceans
Answer: D
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