Select the correct answer from the list.(2 points)

Question

Over the past century, the concentration of greenhouse gases in the atmosphere has
. This has led to
heat being held in the troposphere, where infrared radiation is
likely to encounter a greenhouse gas molecule and be
.
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Answer 1

Over the past century, the concentration of greenhouse gases in the atmosphere has increased. This has led to more heat being held in the troposphere, where infrared radiation is more likely to encounter a greenhouse gas molecule and be absorbed.