All living things require energy. All (well except for some bacteria but that is a different topic) living things take sugar molecules combine them with oxygen to create energy and release CO2 as a product. This process is called respiration. Trees and plants produce their own sugar by using the suns energy and CO2 from the atmosphere and so they do not need to consume anything to obtain sugar. They do however still need to metabolize that sugar via respiration. So yes they do release CO2 for this. However, trees take in more CO2 than they use and store it in themselves in the form of wood and other plant tissue and so as long as they live they are Carbon sinks.
Trees also produce biogenic volatile organic compounds, which includes many hydrocarbon compounds. Different tree species emit different biogenic VOCs, which leads to ozone production near the surface.
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