Question

Is global warming caused by humans, a natural occurrence, or both?

Answer 1

Both have their hands on causing global warming though the force of nature is mighty and uncontrollable.

Explanation:

There is always an argument regarding this question. Two supports even can present their own ration reasons of this devastation.

But those who are on the side of the opinion that natural occurrences are more responsible for global warming point to two main disasters.
They are- (i) Solar changes and
(ii) Changes to the Earth's orbit.

Besides, variations in the Sun's energy output have an impact on changes in Earth’s climate.

http://www.livescience.com/16388-climate-change-debate-man-nature.html