Both of you are dead wrong. Look up Photosynthesis
" The carbon cycle is based on carbon dioxide (CO2), which can be found in air in the gaseous form, and in water in dissolved form. Terrestrial plants use carbon dioxide from the atmosphere, to generate oxygen that will sustain animal life. Aquatic plants also generate oxygen, but they use carbon dioxide from water.
The process of oxygen generation is called photosynthesis. During photosynthesis, plants and other producers transfer carbon dioxide and water into complex carbohydrates, such as glucose, under the influence of sunlight. Only plants and some bacteria have the ability to conduct this process, because they possess chlorophyll; a pigment molecule in leaves that they can capture solar energy with."
And when the plants decompose in a swamp, they release the CO2 they collected in life. So if you look at CO2 sources, the Amazon is one of the top sources of CO2.
(That the Amazon also happens to be a CO2 sink when the plants are alive, I'll concede. It's just funny to watch libs freak because they can't wrap their heads around both sides of that biochemistry.)