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The current changes in the atmosphere are partially due to the exponential increase in the usage of fossil fuels.

Explanation:

From the presented graph we can see the effects of volcanic eruptions and fossil fuels on the atmosphere. What can be easily noticed is that the volcanic eruptions have a relatively steady influence throughout the presented period. On the other hand, it can not be said that that is the case with fossil fuels, as it can be noticed that from 1850, the increase in their usage has gone up significantly.

As the usage of fossil fuels has been increasing, the levels of carbon dioxide in the atmosphere have been increasing as well. While the natural sources of carbon dioxide emissions still surpass the ones from human activity, it still managed to influence the atmosphere and the global climate. It is a natural process of warming up, but even a slight increase on top of the natural processes is able to cause sharp changes in the global climate.

radiative zone

explanation    

radiative zone is the layer of the sun which energy is transferred away from the core by radiation. although, the core is the only part of the sun that produces an appreciable amount of heat through fusion. in fact, 99% of the energy produced by the sun takes place within 24% of the sun's radius.