Higher temps would mean more plant life activity producing more carbon dioxide.
more oxygen, and consuming more CO2.
And also more chlorophyl -- which ultimately is the food of all living organisms here on earth. (I.e., animals eat plants, humans eat plants and animals....)
Wrong Kemosabi. You are right that higher temps might mean more plant growth. However, plants sequester CO2. They take it out of the air and through photosynthesis combine the carbon with hydrogen and oxygen to produce starch which is stored in the plant as an energy source. As by-products they release O2 and water into the atmosphere as by-products. This would actually lower CO2 in the atmosphere and increase the level O2.