Answer :

The question is asking to state the organisms that are responsible for absorbing carbon from the atmosphere, base on my research and further investigation, I would say that the answer would be the Plants and the Trees. I hope you are satisfied with my answer and feel free to ask for more 
The organisms which are responsible for absorbing carbon from the atmosphere is the trees and plants. 

Plants are known as predominant photosynthetic eukaryotes which are mainly multicellular. They are found in the kingdom Plantae. Plants were treated as of the two kingdoms which included all living things that were not animals.

Fungi and algae were treated as plants. Green plants have cell walls which contain cellulose. They get their energy from the sun via the process of photosynthesis.