Carbon dioxide is found abundantly in our atmosphere. As humans  breathe they release Carbon Dioxide. Plants also use Carbon Dioxide  to create Oxygen or O2 molecules.Large … parts of just about every  solid thing are carbon. More than half the contents of a tree is  carbon.o, CO2 is not found in DNA. Deoxyribonucleic acid (DNA) is a polymer of nucleotides. Each nucleotide is made up of a deoxyribose sugar, a nitrogen base (adenosine, cytosine, … guanine, or thymine), and a phosphate group.