Bioluminescence
Bioluminescence is a process done by living organisms that produce light without generating heat.
Using algae to generate bioluminescence can help generate light and at the same time remove carbon dioxide from the air (a gas that exacerbates the greenhouse effect).
Biotechnology can help the planet to produce light without polluting the environment and reducing the concentration of carbon dioxide in the air.
Remember: algae carry out photosynthesis and so they extract carbon dioxide from the air.
Answer: "As the organisms inside photosynthesize, they will remove carbon from the air. "