How do plants help reduce CO2 levels in the atmosphere?

Plants contribute to reducing CO2 levels in the atmosphere primarily through the process of photosynthesis. During photosynthesis, plants absorb carbon dioxide (CO2) from the air and utilize sunlight to convert it into glucose and oxygen. This process not only helps to lower the concentration of CO2 in the atmosphere but also produces oxygen, which is vital for the respiration of most living organisms.

Photosynthesis plays a crucial role in the carbon cycle, as it acts as a natural mechanism for regulating and maintaining the balance of greenhouse gases in the atmosphere. By efficiently capturing carbon dioxide, plants act as carbon sinks, helping to mitigate climate change and its associated impacts.

Other options do not directly contribute to reducing atmospheric CO2 levels. Emitting oxygen is a byproduct of photosynthesis, but it does not, by itself, diminish CO2 levels. Absorbing nitrogen is important for plant growth but does not impact CO2 levels. Releasing methane is a process that can actually contribute to greenhouse gas emissions, rather than reducing CO2 in the atmosphere.