Scientists are using algae to eat carbon dioxide. Algae are microscopic organisms that can grow in both fresh and saltwater. They use sunlight to photosynthesize, which is the process of converting carbon dioxide and water into oxygen and glucose. Algae can be used to remove carbon dioxide from the atmosphere by growing them in large ponds or tanks and then harvesting them. The algae can then be used to produce biofuels, animal feed, or other products.