Question

Why do trees store CO2 more efficiently than smaller shrubs and grasses?

Answer 1

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The trees are more efficient in storing the carbon dioxide then small plants and grass.
This is mainly because the trees consume more carbon dioxide compared to small plants in the first place. After using the received carbon dioxide for photosynthesis and other processes this gas is stored by converting it into plant matter. this gas, as plant matter, is stored in wooden branches and trunk in the trees which are massive in size. whereas in small plants it is only stored in leaves and tender branches.
So simply putting it trees have a large body to take and store sufficient carbon-dioxide efficiently whereas grass and small plants do not.