Mankind has been upsetting the Carbon Dioxide balance for the last two hundred years. It is no surprise that this has an impact on many parts of the biosphere and plays a part in global warming. This work contains 5 complete student experiments involving the use of CO2. Each experiment can be carried out independently or as part of a program of study. It highlights the complex inter-relation between the many physical properties of CO2 and the natural world, while at the same time allowing the student to focus their attention on a single aspect.