Question

Trees maintain the balance between gases in the air, removing carbon dioxide from the air and releasing oxygen.

Answer 1

Yes — that’s essentially correct, with a few important details and limits.

How it works (brief):
- Trees (and other green plants) use photosynthesis: they take in carbon dioxide (CO2) from the air, water (H2O) from the soil, and energy from sunlight to make sugars and oxygen. The simplified chemical equation is:
CO2 + H2O + light → (CH2O) + O2
- The oxygen released during photosynthesis actually comes from the splitting of water molecules, not directly from CO2.
- Plants also respire (use oxygen and release CO2) all the time, including at night. But during daylight their photosynthesis usually produces more oxygen and fixes more carbon than respiration releases, so the net effect is O2 release and CO2 removal.

Why it matters:
- Trees store carbon in their trunks, roots and soil, so they act as carbon sinks and help slow the buildup of atmospheric CO2 that drives climate change.
- Trees also improve local air quality by trapping particulates and absorbing some pollutants.

Important caveats:
- Much of Earth’s oxygen comes from photosynthetic microorganisms in the oceans (phytoplankton), not only from trees.
- Forests and other vegetation do absorb large amounts of CO2, but they cannot fully offset human fossil-fuel emissions by themselves; protecting and restoring forests is one important part of reducing atmospheric CO2, but emissions reductions are still essential.
- If forests are cut or burned, the stored carbon is released back to the atmosphere.

If you want, I can explain the photosynthesis steps in more detail (light reactions and the Calvin cycle), give numbers on how much carbon forests store, or discuss how planting trees helps locally versus globally. Which would you prefer?