Here's how it works:

* Plants, algae, and some bacteria use sunlight, water, and carbon dioxide to produce their own food (glucose) and oxygen as a byproduct.

* This process is essential for life on Earth as it removes CO₂ from the atmosphere and provides the basis of the food chain.

In addition to photosynthesis, there are other processes that can remove CO₂ from the atmosphere:

* Ocean absorption: The ocean absorbs a significant amount of CO₂ from the atmosphere, acting as a carbon sink.

* Weathering of rocks: Chemical weathering of rocks can release calcium ions that react with atmospheric CO₂ and form carbonates, which are eventually deposited in sediments.

* Carbon capture and storage: This is a technology that captures CO₂ from industrial processes and stores it underground or uses it for other purposes.

However, photosynthesis is by far the most important process for removing CO₂ from the atmosphere.