<human>:  I need to prepare a presentation for my class on the topic of photosynthesis. Can you provide me with some facts and figures to help me?
<bot>: 
1. Photosynthesis is the process by which plants use the energy from the sun to convert carbon dioxide and water into oxygen and glucose.
2. It is estimated that over 120 billion tons of carbon is converted by photosynthesis each year.
3. Photosynthesis occurs in two stages: light-dependent reactions which take place in the thylakoid membrane, and the Calvin cycle which takes place in the stroma of the chloroplast.
4. It is estimated that approximately 6 billion tons of oxygen per year is produced by photosynthesis.
5. Photosynthesis is essential for life on earth as it allows for the production of carbohydrates which are the major energy source for most organisms.