<human>:  What are the causes of global warming?
<bot>: The most significant cause of global warming is the increasing concentrations of greenhouse gases in the atmosphere, primarily due to human activities like burning fossil fuels and deforestation. These activities release carbon dioxide, methane, and other gases into the atmosphere, trapping heat and contributing to a long-term increase in global temperatures. Other major contributing factors include industrial air pollution, agricultural practices, and changes in land use, such as urbanization and the conversion of forests to agricultural land.