One problem with landfills is that they can release harmful gases into the atmosphere. These gases, such as methane, can cause environmental damage and contribute to climate change. Another problem with landfills is that they take up valuable space. This can create a shortage of land for other purposes, such as housing or agriculture. Finally, landfills can be a source of water pollution. When rainwater seeps through the landfill, it can pick up pollutants and carry them into nearby waterways.