So you want to use plants to reduce CO₂

Cant even grow enough plants to eat, let alone try something as crazy as sequestering the carbon for one adult human.

Even elementary school students know that plants consume oxygen at night, for respiration of their photosynthesized carbohydrates.

Iirc , decaying plant material can release greenhouse gases far more powerful than CO2.

Magic plants exist, and can help with congnition if properly consumed.