The upcoming COP28 climate talks in Dubai are set to address not just carbon dioxide (CO2), the most notorious greenhouse gas, but also methane (CH4), a potent but relatively short-lived emission. Methane’s significant impact on global warming, despite its brief atmospheric lifespan, makes it a crucial target for immediate emission reduction efforts, especially because much of it leaks from fossil fuel infrastructure.
Methane, the primary component of natural gas, is the second-largest contributor to climate change, accounting for approximately 16% of the warming effect. It remains in the atmosphere for only about a decade but is far more impactful than CO2, with a warming effect 28 times greater over a 100-year period and 80 times over 20 years. Despite advancements in satellite monitoring of emissions, the exact amount of methane released into the atmosphere is still uncertain. Presently, methane concentrations are over two-and-a-half times higher than pre-industrial levels.
Human activities are responsible for around 60% of methane emissions, as per the International Energy Agency (IEA), with natural sources like wetlands contributing the rest. Agriculture is the largest human-related source, particularly from livestock digestion and manure, as well as rice cultivation, which creates ideal conditions for methane-producing bacteria. The energy sector, including coal, oil, and gas industries, follows as the second largest source, with methane leaks occurring from energy infrastructure and during maintenance. Additionally, significant quantities of methane are emitted from decomposing household waste in landfills.
Rapid cuts in methane emissions, particularly from the fossil fuel sector, could prevent up to 0.1 degrees Celsius of warming by mid-century, according to an IEA report. This reduction would have a significant impact, equivalent to removing all cars and trucks globally from roads. Measures to achieve this include repairing leaky infrastructure and eliminating routine flaring and venting during pipeline maintenance.
The “Global Methane Pledge,” initiated by the EU and US in 2021, aims to reduce global methane emissions by 30% by 2030 compared to 2020 levels. Over 150 countries have signed this pledge, but major emitters like China, India, and Russia are notable absentees. While the pledge is a step forward, it lacks stringent enforcement mechanisms, leading to calls for COP28 to formalize stronger reduction targets, particularly a 60% cut in the energy sector.
Both the United States and China have incorporated methane into their climate action plans. China has revealed plans to control its emissions, though without quantified targets. The effectiveness of China’s plan remains to be seen in the absence of specific reduction goals. Furthermore, oil and gas companies have proposed their own commitments, including the Oil and Gas Climate Initiative’s goal of zero emissions from their operations by 2030.
The COP28 negotiations could mark a significant turning point if they lead to a global commitment on methane reduction, strengthening the efforts to mitigate one of the most potent greenhouse gases contributing to climate change.
https://www.rte.ie/news/environment/2023/1121/1417639-cop28/