The Lomas Los Colorados landfill near Santiago, Chile, is the largest single human-made source of methane emissions globally [1].
This finding highlights the critical role of waste management in climate change, as methane is a potent greenhouse gas that accelerates atmospheric warming. Because the landfill serves a massive urban population, its emissions profile has a disproportionate impact on global climate targets.
The identification came in a report released by the UN Environment Programme on May 4, 2024 [1]. The facility, located on the outskirts of Santiago, has become a focal point for environmental monitoring due to the volume of organic waste it processes [1, 2].
According to the data, the landfill serves a population of more than seven million people [3]. The sheer scale of the waste generated by this population leads to extensive decomposition processes. These processes release large quantities of methane into the atmosphere, cementing the site's status as a major climate-warming source [1, 4].
Environmental experts said that landfills are often overlooked as primary emitters compared to industrial plants or livestock. However, the Lomas Los Colorados site demonstrates how concentrated urban waste can create a localized emission point that rivals global industrial sources [4].
Efforts to mitigate these emissions typically involve capturing methane for energy use or improving waste diversion. The UN report underscores the urgency for Chile to implement more aggressive waste management strategies to reduce the footprint of its capital city's waste stream [1].
“The Lomas Los Colorados landfill is the largest single human-made source of methane emissions globally.”
The designation of a single landfill as the world's top human-made methane source shifts the focus of climate mitigation toward urban infrastructure. It suggests that improving municipal waste systems in rapidly growing cities can provide immediate, high-impact reductions in global greenhouse gas levels, potentially offering a faster route to climate goals than transitioning some industrial sectors.
