Answer
B.
Work Step by Step
The answer is an environmental indicator because carbon dioxide concentration within our planet's atmosphere is resulting in a steady increase in temperature. The CO2 is largely due to human pollution.
Environmental Science for AP* (2nd Edition)
by Friedland, Andrew J.; Relyea, Rick
Published by
W. H. Freeman
ISBN 10:
1464108684
ISBN 13:
978-1-46410-868-6
Chapter 1 - AP Environmental Science Practice Exam - Section 1: Multiple-Choice Questions - Page 28: 4
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