Learn how recycling has grown in popularity over time and find out what kinds of careers are involved in this rapidly growing industry. Calling All Innovators series introduces students to careers in science and technology. The complex text allows readers (Grades 5-8) to determine the main idea and explain how it is supported by key details. From leftover food to packaging materials to outdated or broken technology, humans produce an enormous amount of waste. Readers will find out how some of today's top innovators are working to find new recycling methods and cut down on the amount of trash the ends up in landfills.