Say "algae" and most people think of pond scum. What they don't know is that without algae, none of us would exist. There are as many algae on earth as stars in the universe, and they have been essential to life on our planet for aeons. Algae created our oxygen-rich atmosphere, abundant oceans and coral reefs. Crude oil is made of dead algae, and algae are the ancestors of all plants. Today, seaweed production is a multi-billion-dollar industry, with algae hard at work to make your sushi, chocolate milk, beer, paint, toothpaste, shampoo and so much more. Delving into science and history, in this revelatory book Ruth Kassinger takes readers on an around-the-world, behind-the-scenes, and into-the-kitchen tour. We'll meet the algae innovators working towards a sustainable future: from seaweed farmers in South Korea, to scientists using it to clean the dead zones in our waterways, to the entrepreneurs fighting to bring algae fuel and plastics to market. Whether you thought algae was just the gunk in your fish tank or you eat seaweed with your porridge, Bloom will overturn everything you thought you knew about these little green cells and the immense power that they hold. This could be the future of our rapidly changing world.