Which would cause green plants to produce more oxygen?

More carbon dioxide (CO2) in the atmosphere. Plants use CO2 during the process of photosynthesis, which converts light energy into chemical energy that the plant can use. When there is more CO2 in the atmosphere, plants can photosynthesize more efficiently and produce more oxygen.

Increased light intensity. Plants need light to photosynthesize, so more light intensity will lead to increased oxygen production. This is why plants in sunny areas tend to grow more quickly and produce more oxygen than plants in shady areas.

Increased temperature. Plants generally photosynthesize more efficiently at higher temperatures, up to a certain point. The optimal temperature for photosynthesis varies from plant to plant, but most plants will photosynthesize more quickly at temperatures between 20 and 30 degrees Celsius.

Increased water availability. Plants need water to photosynthesize, so more water availability will lead to increased oxygen production. This is why plants that are watered regularly tend to grow more quickly and produce more oxygen than plants that are not watered as frequently.

Increased nutrient availability. Plants need nutrients to photosynthesize, so more nutrient availability will lead to increased oxygen production. This is why plants that are fertilized regularly tend to grow more quickly and produce more oxygen than plants that are not fertilized as frequently.