Consider the following diagram,and then answer the question below.

-According to current scientific consensus,what is the reason for the upward trend in overall CO₂ concentrations demonstrated in the graph above?
A)large and increasingly frequent volcanic eruptions
B)changes in Earth's atmosphere brought about by natural climate variation
C)rapidly increasing fossil fuel combustion and the resulting emissions
D)The causes are still unknown.

Question

Consider the following diagram,and then answer the question below.
 
-According to current scientific consensus,what is the reason for the upward trend in overall CO₂ concentrations demonstrated in the graph above?
A)large and increasingly frequent volcanic eruptions 
B)changes in Earth's atmosphere brought about by natural climate variation 
C)rapidly increasing fossil fuel combustion and the resulting emissions 
D)The causes are still unknown.

Quizplus · Accepted Answer

The graph shows a clear and steady increase in CO₂ concentrations over time, which is primarily attributed to human activities such as the burning of fossil fuels. Volcanic eruptions and natural climate variation may contribute to short-term fluctuations, but they are not the main cause of the overall upward trend. Current scientific consensus supports the idea that human activities are responsible for the increase in CO₂ concentrations, and this is also consistent with other lines of evidence such as the isotopic composition of atmospheric CO₂.

Consider the Following Diagram,and Then Answer the Question Below