About plants: so photosynthesis produces oxygen as a waste product, but then respiration uses oxygen to produce carbon dioxide, so like doesnt that 'cancel' each other out? im confused if plants are actually helpful or not (oxygen wise)

plants are very helpful because we get oxygen from plants to inhale and Excel carbon dioxide which is unsuitable for a good environment plants inhale carbon dioxide and consumed at and XL oxygen which we inhale carbon dioxide is a major reason for global warming and plants are very helpful in our life because if there are no plants = no life because no oxygen