Question

how do we get the supply of carbon dioxide​

Answer 1

SUPPLY OF CO2
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It can be created by the combustion of fossil fuels or vegetable matter, among other chemical processes. Carbon Dioxide, CO2, is a colorless, odorless, incombustible gas, present in the atmosphere and formed during respiration. ... Carbon dioxide is composed of one carbon atom covalently bonded to two oxygen atoms.

Answer 2

we can get the supply of carbon dioxide if we sleep underneath the trees.

this is because during night it respires i.e takes in oxygen and gives out

carbon dioxide.

                                                    hope it helps................