How does changing the amount of carbon dioxide in a plant's environment affect its growth? Select one: Decreasing the amount of carbon dioxide in the environment will always cause a plant to grow more. The amount of carbon dioxide in a plant's environment does not affect its growth. Increasing the amount of carbon dioxide in the environment will always cause a plant to grow more. Increasing the amount of carbon dioxide in the environment will cause a plant to grow more if it has enough sunlight and water.