The Goal
The entire purpose of the experiment was to provide some tangible information to climate change deniers. Kurtis' point was simple. Plants are necessary for humans to survive and the more CO2 that humans pump out and the more plant life humans wipe out, the less oxygen is produced to combat the CO2, which is extremely harmful to humans in large quantities. So, he believed that the plants in his greenhouse would convert his CO2 into oxygen for him, and the cycle would continue throughout the duration of his experiment.
Logging the Co2
Through his experiment, he hoped to prove that even if industrial CO2 emissions surpassed the amount that humans exhale, the plants should be able to handle it and adjust accordingly so that humans could survive. So, for his experiment, he believed that the plants should be able to adjust to the CO2 that he was exhaling. Luckily, they were logging everything to see if this was actually the case...