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Environmental Pollution Science Fair Project

How Does CO2 Affect Plant Growth?

How Does CO2 Affect Plant Growth? | Science Fair Projects | STEM Projects
We're investigating how increased carbon dioxide levels in the atmosphere can affect plant growth. We'll be looking at how temperature, water vapor, and other factors can influence the growth of plants.


The hypothesis is that increased carbon dioxide levels will have a positive effect on plant growth.

Method & Materials

You will germinate seeds in moist potting soil, create a chemical reaction to produce carbon dioxide, monitor the progress of the plant growth, water vapor, and temperature for one week, and compare the effects of CO2 to the control group.
You will need two large soda bottles with the top removed, two peat cups, a small cup or dish, several crop seeds, potting soil, 10 grams of baking soda, 20 ml of vinegar, and a thermometer.


The experiment showed that increased carbon dioxide levels had a positive effect on plant growth. The most notable observation was that the plants in the CO2 system grew faster than the plants in the control group.

Why do this project?

This science project is interesting and unique because it shows how increased carbon dioxide levels can affect plant growth, and how this can contribute to global warming.

Also Consider

Consider experimenting with Elodea in a closed system such as a soda bottle with water. Try blowing into the container through a straw and compare the results to a sealed system.

Full project details

You can find additional information and details for this science fair project here. Have fun exploring!

Related video

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