Question

which is not a naturally occurring greenhouse gas?
a methane
b carbon dioxide
c water vapor
d nitrous oxide
e chlorofluorocarbons (cfcs)
question 41
if global warming continues and predictions are correct by the end of the twenty - first century, sea level on earth will:
a remain the same
b rise by 20 cm
c lower by 20cm
d rise by 1m

Explanation:

For the first question: Methane, carbon dioxide, water vapor, and nitrous oxide are naturally occurring greenhouse gases from sources like decomposition, respiration, and volcanic activity. Chlorofluorocarbons (CFCs) are synthetic, human-made chemicals.
For the second question: Global warming causes glacial ice melt and thermal expansion of seawater. IPCC predictions indicate sea level rise by the end of the 21st century is likely to be around 1 meter under high-emission scenarios.

Answer:

E. chlorofluorocarbons (CFCs)
D. Rise by 1m