Here's how it works:

* Photosynthesis: Plants use a process called photosynthesis to convert light energy into chemical energy.

* CO2 as a building block: During photosynthesis, plants take in carbon dioxide from the air through tiny pores called stomata on their leaves.

* Sugar production: The plant combines the carbon dioxide with water (H2O) and sunlight to create glucose (a type of sugar) and oxygen (O2).

This process is essential for plant life and for the entire food chain, as it provides the energy source for most living things.