The concentration of carbon dioxide in the atmosphere in 2011 was 394 ppm and the trend is increasing.What is the implication of this for humans.
A) this exceeds the natural range of carbon dioxide levels for the last 800 000 years and may lead to unequalled rates of atmospheric warming.
B) this exceeds the natural range of carbon dioxide levels for the last 800 000 years and may lead to unequalled rates of atmospheric cooling.
C) this rate is part of the natural evolution of the atmosphere and all life on Earth is capable of adapting.
D) humans do not contribute to the changes in this atmospheric component,so there is no implication for us.
Correct Answer:
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