A recent study published in the journal Science highlights a troubling issue: More than half of U.S. landfills are significant sources of methane emissions, a potent greenhouse gas. This investigation, conducted by the Carbon Mapper research group, in collaboration with renowned institutions such as NASA's Jet Propulsion Laboratory and the University of Arizona, is the largest assessment of methane emissions from landfills ever.
According to the research, about 52% of landfills analyzed through aerial surveys have sources of methane emissions, a worrying contrast to the 0.2% to 1% identified at super-emitting sites in the oil and gas sector, the largest source of methane emissions. in the United States. . Identifying these emissions provides an immediate opportunity to mitigate their impacts and enhance climate benefits by tackling one of the most powerful and widespread greenhouse gases.
What are the impacts of ongoing emissions from landfills?
According to Dan Cosworth, a carbon mapping scientist and lead author of the study, 60% of large landfills emit methane continuously, for months or even years. This differs significantly from the oil and gas sector, where most emissions from large emitters are short-lived events. This factor highlights the opportunity and need to focus on actions to mitigate ongoing emissions from landfills.
How can regulatory agencies act on methane emissions from landfills?
The study notes that regulators and companies have so far relied on typical estimates of emissions from landfills, as well as surveys using hand-held methane sensors, which provide a less comprehensive view of reality. However, as aerial surveys advance and more satellites are launched, it is expected that regulators will be able to measure, quantify and act more effectively on methane emissions from landfills.
How much methane emissions will be reduced according to the study?
The research revealed that emissions rates detected through aerial surveys are 1.4 times higher than estimates from the US Environmental Protection Agency's (EPA) Greenhouse Gas Reporting System. This discrepancy highlights the importance of updating and improving monitoring and reporting methods to more accurately reflect the true scale of emissions.
Efforts to combat global warming often focus on reducing carbon dioxide emissions. However, methane, which is about 25 times more powerful in trapping heat in the atmosphere than carbon dioxide over a 100-year period, represents an equally important front in the fight against climate change. This study underscores the urgent need to expand regulatory and mitigation focus to include methane emissions, especially those from landfills, which have so far been relatively neglected compared to other sectors.
As a society, we face the urgent challenge of tackling climate change through immediate and effective action. The knowledge and technology to identify and mitigate super emitters of methane exists; Now is the time to put these tools into action to protect our planet for future generations.
