Global warming refers to the average increase in Earth's temperature caused by too many greenhouse gases trapping heat in the atmosphere. The three major greenhouse gases are carbon dioxide, methane, and nitrous oxide, which are emitted through activities like burning fossil fuels, deforestation, agriculture, and industrial processes. Since 1980, abnormal rises in global temperatures have been observed, likely due to increased greenhouse gas levels. Reducing greenhouse gas emissions through individual actions can help mitigate the impacts of climate change.