The document discusses the greenhouse effect and global warming. The greenhouse effect refers to gases in the atmosphere that trap heat from the sun, causing the Earth's temperature to rise. Global warming is an increase in the Earth's average temperature that results from the greenhouse effect. Some causes of the greenhouse effect and global warming are deforestation, emissions of gases like carbon dioxide and methane, and releases of carbon dioxide from human activities like burning fossil fuels. Consequences of the greenhouse effect and global warming include extreme weather, sea level rise, and impacts on ecosystems and human health and economies. The document provides suggestions for preventing global warming such as reducing energy use and choosing renewable energy sources.