* Photosynthesis: During the day, trees use sunlight, water, and carbon dioxide to create their own food (sugars) and oxygen. This process is called photosynthesis, and it's how trees remove carbon dioxide from the atmosphere.
* Respiration: At night, trees, like all living organisms, need energy to survive. They do this through respiration, which involves breaking down the sugars they created during photosynthesis. This process releases carbon dioxide as a byproduct.
So, the balance:
* During the day: Trees absorb more carbon dioxide than they release.
* During the night: Trees release carbon dioxide, but it's a much smaller amount than they absorbed during the day.
Overall: Trees are net absorbers of carbon dioxide. This means they take in more carbon dioxide than they release over their lifetime, playing a vital role in mitigating climate change.