The modern world is full of remarkable developments that have improved life for millions of people, from cars and plastic packaging to food-delivery services and social media. However, many of these developments come at a considerable cost. This series looks at both the positive aspects of modern developments as well as the problems they create, such as pollution, using up resources, overcrowding, and cyber-bullying. The efforts being made to reduce some of the most negative effects are highlighted in features such as "Tech Solution" and "Emergency Case Studies," along with suggestions for readers on what they can do to help. Free downloadable Teacher's Guide.