The primary cause of the greenhouse effect is the accumulation of greenhouse gases in the Earth's atmosphere. These gases, such as carbon dioxide, methane, and nitrous oxide, trap heat from the Sun, preventing it from escaping back into space. This natural process is essential for maintaining the Earth's temperature; however, human activities, particularly the burning of fossil fuels and deforestation, have significantly increased greenhouse gas concentrations. The enhanced greenhouse effect leads to global warming and changes in climate patterns, resulting in various environmental impacts, such as rising sea levels and extreme weather events.