Over time landfills can be removed, especially those in hot climates, so as to stop leachate contamination of potential groundwater sources and to stop landfill gasses being released to atmosphere where methane is23 times more harmful than carbon dioxide.

• 以后垃圾掩埋法将被淘汰(别是在热带气候中)以防止可能的地下水源渗漏液污染与沼气释放到大气中，如果沼气含量扩大23倍，则比二氧化碳的危害更大。