The biosphere is the Earth's system that is most responsible for the increases in global warming. Thus, the correct option is A.
What is Biosphere?
The Biosphere may be defined as the part or region of the earth's surface where living organisms live and interact with each other. It comprises all the ecosystems that existed on Earth.
This is the region where various greenhouse gases are significantly emitted due to humans or any other living activity and get absorbed by various layers of atmosphere.
Such greenhouse gases are responsible for the causation of global warming across the globe.
Therefore, the biosphere is the Earth's system that is most responsible for the increase in global warming. Thus, the correct option is A.
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