Landfill can increase the chances of global warming by releasing methane, a dangerous greenhouse gas.Landfills are taking up lots of our land and that can also take away habitats for other animals.Landfills contain a lot of kitchen scraps and organic material. As the landfill is constantly being covered with new garbage the organic material decomposes anaerobically (that is, without air). Anaerobic decomposition produces methane, which is a 20 times more dangerous greenhouse gas than carbon dioxide.