The document discusses the greenhouse effect, including the natural greenhouse effect which regulates the Earth's temperature and the enhanced, man-made greenhouse effect caused by burning fossil fuels. It describes the major greenhouse gases like carbon dioxide, methane, and water vapor that trap heat in the atmosphere. The document also outlines some effects of climate change like rising sea levels and impacts on agriculture, water resources, weather patterns, and humans/wildlife. It concludes by providing recommendations for reducing human-caused greenhouse gas emissions through individual actions like using less energy and driving less.