<human>:  What are the main causes of global warming?
<bot>: The main causes of global warming are increased emissions of carbon dioxide and other greenhouse gases into the atmosphere due to human activities such as burning of fossil fuels for energy, deforestation, and agricultural practices. Other activities that contribute to global warming include the use of chlorofluorocarbons (CFCs) in refrigeration and air conditioning systems, inadequate insulation in buildings, energy-inefficient appliances, and burning of waste materials that release methane, a powerful greenhouse gas.