With brio and great wisdom, Ruth Kassinger demonstrates how the apparently humble and often disregarded algae ( pond scum ) are actually amongst the major engines of life on our planet. Bloom is a classic of our environmental crisis, alongside books such as Elizabeth Kolbert's The Sixth Extinction. - Peter Forbes, author of The Gecko's Foot; A book full of delights and surprises . . . This is a beautiful evocation of the many ways that our past and future are entangled in their emerald strands - David George Haskell, author of Pulitzer Prize-finalist The Forest Unseen; Ruth Kassinger is a witty and affable guide throughout this globetrotting celebration of an overlooked life form - Thor Hanson, author of Buzz, The Triumph of Seeds and Feathers; 'Engaging and deeply informative' - Elizabeth Kolbert, author of The Sixth Extinction: An Unnatural History