What is one reason that greenhouse gases in the Earth's atmosphere have increased?
A) reforestation in tropical areas
B) the restricted use of CFCs
C) planting of new seedlings
D) the burning of fossil fuels
Correct Answer:
Verified
Q12: Which substance correlates closely with estimated variations
Q13: On what factor does correspondence between climate
Q14: How long did glacial periods,which occurred over
Q15: What is NOT likely to be projected
Q16: Which statement describes the greenhouse effect?
A) Heat trapped
Q18: What is NOT likely to be a
Q19: What is one reason that polar bears
Q20: What would result if warming occurs in
Q21: Which outcome of global warming is unlikely
Q22: Which of the following is NOT a
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