The main cause of the greenhouse effect is the accumulation of greenhouse gases in the Earth's atmosphere. These gases, such as carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O), trap heat radiating from the Earth's surface, preventing it from escaping into space. Human activities like burning fossil fuels, deforestation, and industrial processes significantly increase the concentration of these gases. This leads to a rise in the Earth's average temperature, contributing to climate change and its associated consequences, including extreme weather and shifting ecosystems. Addressing the greenhouse effect is crucial for environmental sustainability.