Q48. Which of the following statements about changes in greenhouse gases is NOT

Question

Q48. Which of the following statements about changes in greenhouse gases is NOT true?
Check all that apply:
A. Based on observations made on Mauna Loa, climatologists have demonstrated that CO2 has increased dramatically since the 1950s.
B. Based on observations made on Mauna Loa, climatologists have demonstrated that CO2 concentrations go up and down each year, increasing during the Northern hemisphere's winter and decreasing during its summer.
C. Based on data from ice cores, climatologists have demonstrated that CO2 concentrations have varied dramatically over the past 600,000 years, and were frequently well in excess of recent values.

Q47. While variation in solar output explains some of the increase in mean global temperature over the past 150 years, it is not nearly as important as the climate forcing resulting from human activities.
A.Yes
B. No

Explanation / Answer

48) a and c

47) yes

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.