<human>:  What are the underlying causes of global warming?
<bot>: The underlying causes of global warming include increasing levels of carbon dioxide and other greenhouse gases in the atmosphere, deforestation, and land-use change. These activities are increasing the amount of energy that is being trapped in the atmosphere, resulting in an increase of the Earth's average temperature. Additionally, human activities such as burning fossil fuels, animal agriculture, and the use of chemical fertilizers are also contributing to climate change.