This edition examines the issue of global warming by placing opinions from a wide range of sources in a pro versus con format. Readers explore whether or not global warming is actually occurring, and the potential threats posed by global warming, such as crop failure and extreme weather. Opinion essays also debate proposed ways to prevent or minimize global warming. Top-notch essay sources include the National Academy of Sciences, Environment New Jersey Research and Policy Center, Bryan Appleyard, and Anne Jolis.