People tend to forget that plants only respirate O2 during photosynthesis, which produces sugars from the carbon in C02 and stores them. When those are metaboli

People tend to forget that plants only respirate O2 during photosynthesis, which produces sugars from the carbon in C02 and stores them. When those are metabolized, the plant consumes 02 and puts C02 back into the atmosphere. It's why plants can live in sealed terrariums. To really offset what a human produces, you need a lot more plants than you would probably be comfortable living with.