Fossil fuels are dominating the planet and will sooner or later kill it and the people who live on it. Algae are a group of aquatic organisms that have the ability to perform photosynthesis. Most algae can grow on their own in various forms. There are seven types of organisms that make up algae. They are grouped based on the types of pigments they use for photosynthesis, the formation of their cell walls, the types of carbohydrate compounds they store for energy, and the types of flagella (whip-like structures) they use for movement. The colors of algae types are due to mixtures of photosynthetic pigments, which are a combination of one or more green-colored chlorophylls as the main pigments. Some algae are familiar to most people, such as marine algae (algae or phytoplankton), scum from ponds, or algal blooms in lakes. Say no to plagiarism. Get a tailor-made essay on "Why Violent Video Games Shouldn't Be Banned"? Get an original essayThere are various types of algae that are useful to us and our planet. Most algae grow through photosynthesis, converting sunlight, CO2, and nutrients, such as nitrogen and phosphorus, into biomass. This is called “autotrophic” growth. Other algae can grow in the dark using sugar or starch, called “heterotrophic” growth, or even combine both growth techniques, called “mixotrophic” growth. Most algae live in aquatic habitats. They can survive in freshwater lakes or saltwater oceans. They can also sustain a range of temperatures and concentrations of oxygen or carbon dioxide. Algae are able to survive on land and grow on tree trunks, animal fur, snowdrifts, hot springs, and soil. Probably the most important contribution of algae to our environment and well-being is the generation of oxygen through photosynthesis. They play an important role in many ecosystems, ensuring the aquatic food chain, supporting all fisheries in the oceans and inland, as well as producing around 70% of all the air we breathe. Algae help keep atmospheric levels of carbon dioxide stable by storing it in organic materials such as oil deposits and inorganic carbonate rocks. All algae have the ability to produce energy-rich oils, and several species of microalgae naturally accumulate high levels of oil in their dry mass. With the recent rise in oil prices and concern about global warming caused by carbon dioxide emissions, biofuels have regained popularity. There are three main types of biofuel; Ethanol, biodiesel and biojet fuel. Ethanol is used in engines that burn gasoline. Biodiesel is used in engines that burn diesel fuel, such as in large trucks and tractors. Biojet fuel is used in airplanes. Biofuel is an excellent alternative to fossil fuels. There are many ways to make biofuels, but they usually use chemical reactions, fermentation, and heat to break down starches, sugars, and other molecules in plants. The remaining products are then refined to produce a fuel that can be used by cars. Petrol and diesel are ancient biofuels. Gasoline and diesel are fossil fuels because they are made from decomposed plants and animals that have been buried underground for millions of years. Biofuels are similar, except they are made from plants grown today. Since plants absorb carbon dioxide as they grow, crops grown for biofuels should.