This document summarizes five types of clouds: stratus, cumulus, cirrus, nimbostratus, and cumulonimbus. It describes the key characteristics of each cloud type such as their appearance, height, how they form, and whether they bring precipitation. The document also discusses how clouds impact the Earth's climate and environment by trapping heat and reflecting sunlight. It concludes by encouraging readers to protect the atmosphere from harmful pollutants that degrade air quality and affect public health.