This document provides an overview of climate change and global warming for the American public. It explains that climate is measured over centuries rather than days or years, and that human activity is largely responsible for unprecedented warming. Even a few degrees of temperature rise could have major negative consequences like more frequent heat waves, droughts, wildfires, spread of diseases, violent storms, and rising sea levels that inundate coastal areas. The document discusses debates around these issues and seeks to provide factual information to address public confusion around the science of climate change.