Philippines' Sources of CH4 Emissions
Key Insights
2024 CH4 Emissions Profile
Philippines methane emissions totalled around 78.7 megatonnes CO2e in 2024. Crop emissions dominated at roughly 45.5 megatonnes CO2e, or 57.8%, rising by about 0.17 megatonnes CO2e per year over the ten years to 2024. Waste was 10.5 megatonnes CO2e (13.3%) and fugitive emissions 10.2 (12.9%), both rising by about 0.19-0.21 annually. Livestock was 10.2 (13.0%) and declining by roughly 0.11 annually; fuel was 2.3 (3.0%) and nearly stable. Other emissions were negligible.
Historic Livestock Emissions
Livestock emissions rose from roughly 1.1 megatonnes CO2e in 1851 to around 10.3 in 1968. They peaked at about 12.8 megatonnes CO2e in 1973, then fell to roughly 8.4 in 1976 before recovering unevenly. In 2024, livestock emissions were around 10.2 megatonnes CO2e.
Historic Fugitive Emissions
Fugitive emissions began near zero in 1851 and rose gradually to around 0.8 megatonnes CO2e by 1951, then to roughly 4.2 by the late 1980s. They declined to about 2.8 in 1996 before rising strongly, peaking near 11.4 megatonnes CO2e in 2021. They ended at around 10.2 in 2024.
Historic Waste Emissions
Waste emissions rose steadily from about 0.5 megatonnes CO2e in 1851 to roughly 3.5 in 1974. Growth then accelerated, with emissions reaching their record high of around 10.5 megatonnes CO2e in 2024. Waste emissions ended the record at approximately 10.5 megatonnes CO2e.
Historic Crop Emissions
Crop emissions rose from roughly 3.1 megatonnes CO2e in 1851 to around 29.9 by the early 1960s, with especially rapid growth after 1950. They then varied around 29-35, peaking near 34.6 in 1975, before rising again after the late 1990s. Emissions reached about 45.5 megatonnes CO2e in 2024.
Historic Fuel Emissions
Fuel emissions rose from around 0.1 megatonnes CO2e in 1851 to roughly 2.6 in 1982. They peaked at about 2.8 megatonnes CO2e in 1989, then dipped to around 1.9 in 2004 and partly recovered. Fuel emissions ended at approximately 2.3 megatonnes CO2e in 2024.
Historic Other Emissions
Other methane emissions remained negligible throughout the record. They briefly reached roughly 0.04 megatonnes CO2e in 1949 before declining to near zero. In 2024, other emissions were around 0.0002 megatonnes CO2e.
Background
The chart shows a national breakdown by source of the yearly methane (CH4) emissions from human activities expressed as weight in megatonnes (Mt). In the scientific literature, these are referred to as anthropogenic emissions. Human-induced methane emissions increase atmospheric methane, which is warming the Earth. The sources of human methane emissions are
- Livestock
- Fugitive emissions from the fossil fuel industry
- Crop production
- Fossil fuel combustion
- Waste management
- Other processes
Methane's Global Warming Potential
Methane has a much higher Global Warming Potential (GWP) than CO2. However, Methane emissions in the atmosphere decay with an average lifetime of about 12 years so its long term warming-effect is much less compared to CO2 which stays on average for hundreds of years in the atmosphere. Meaning: Methane's short term warming effect is much higher, but long term warming effect is much lower. A reduction in emissions can cause a rapid decline in its atmospheric levels.
Livestock
Livestock emits methane that is produced in the animals' digestive system. Most methane is emitted from the mouth during rumination. A much smaller amount of methane is emitted from the manure. Depending on how the manure is managed, i.e., wet or dry, more methane is emitted. Wet management leads to higher methane emissions than dry management. However, dry management also emits nitrous oxide (N2O), which is another potent greenhouse gas.
Fugitive emissions from fossil fuel industry
Fugitive methane emissions are from the intentional and accidental release of methane, which happens during the extraction, storage, and transportation processes in the fossil fuel industry. Examples are methane leaks during oil and gas handling, storage, transport, incomplete combustion, and many more. Also, methane is deliberately ventilated from mines during the extraction of coal.
Methane is a primary part of “gas”, also called “natural gas” or “fossil gas”. Natural gas is used, for example, for heating and electricity generation, whereby it emits CO2 during the combustion process. However, when natural gas leaks (unburned) it contains a lot of fugitive methane emissions.
Waste
Waste from landfills and wastewater produces a lot of methane when biodegradable material breaks down without oxygen.
Crop production
Crop production emissions are largely from rice cultivation, which generates large amounts of methane during plant growth. These emissions are from flooded paddies, which create the swamp-like environment of rice fields. There are agricultural techniques to reduce emissions significantly, like periodic drainage and aeration. Rice is the main staple for about half the world's population, and its emissions are a significant part of total human methane emissions.
Fuel combustion
Fuel combustion emissions are mostly from the incomplete combustion of fossil fuels. As mentioned before, natural gas consists largely of methane, and when the combustion does not happen completely, methane enters the atmosphere.
Other
Other human-induced methane emissions include industrial processes and product uses.
Wikipedia: Anthropogenic Sources of Atmospheric MethaneIPCC: AR6, 5.2.2.2 Anthropogenic CH4 emissions
Units and Measures
CH4 emissions are expressed in the total weight in megatonnes per year. 1 Megatonne is equal to 1 million tonnes.
Wikipedia: MegatonneWikipedia: Global warming potential
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National methane emissions data through 2024 is from the PRIMAP-hist dataset, which combines several published sources into a historical emissions time series.
The Key Insights paragraph was created using a large language model (LLM) in combination with our data, historic events, and a structured approach for best accuracy by separating the context generation from the interpretation and narrative.
Data Sources
PRIMAP-hist The PRIMAP-hist national historical emissions time series (1750-2024)
Update cycle: Every few monthsDelay: Less than 1 yearCredits: Gütschow, J.; Busch, D.; Pflüger, M. (2025): The PRIMAP-hist national historical emissions time series v2.7 (1750-2024). zenodo. doi:10.5281/zenodo.17090760