Cutting methane quickest way to limit global warming

Blurb: The UN says farming produces 40% of human-caused emissions. Alternative animal feeds to reduce methane from livestock, shifting towards plant-based diets and draining rice paddy fields will all help. Methane is 84 times more potent at trapping heat than carbon dioxide in the short term, so reducing methane is the fastest way to limit […]

Blurb: The UN says farming produces 40% of human-caused emissions. Alternative animal feeds to reduce methane from livestock, shifting towards plant-based diets and draining rice paddy fields will all help.

Methane is 84 times more potent at trapping heat than carbon dioxide in the short term, so reducing methane is the fastest way to limit global temperature rises. Urgency is needed to avoid the worst effects of climate change once world temperatures rise 1.5 Celsius above pre-industrial levels. Scientists warn of extreme droughts, floods, and wildfires, along with food shortages for hundreds of millions of people on a warmer planet. Earth is heating quicker than previously thought and methane from oil and gas production, agriculture and landfill waste must be scaled back.

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Rising temperatures have brought the 1.5 C threshold “perilously close” said United Nations secretary general Antonio Guterres. Commenting on the IPCC’s August 2021 climate science report, Guterres called its evidence of rapid warming “a code red for humanity” requiring immediate action.

While globally, human activity produces between 50-65% of total methane emissions. Heat is trapped much more efficiently by methane, but it reacts with oxygen and is removed from the atmosphere in around 10 years, so drastically cutting methane can rapidly reduce human climate impacts.

Cutting human-caused methane emissions by 45% by 2030 would keep us below the 1.5 C threshold, according to a UN methane assessment. Projections show that it would prevent 255,000 premature deaths, 73 billion hours of lost labour due to extreme heat, and 26 million tons of crop losses globally.

Returning to ‘business as usual’ after the industrial lull brought on by Covid only stalled climate change, and the world is behind in its battle to cut emissions, said World Meteorological Office secretary general Petteri Taalas.

In fact, methane emissions surged in 2020 by the largest amount since records began, along with an increase in carbon dioxide. Combating greenhouse gases at the source has become an urgent necessity. The UN says farming produces 40% of human-caused emissions. Alternative animal feeds to reduce methane from livestock, shifting towards plant-based diets and draining rice paddy fields will all help.

Waste industries could cut about 35% from their total of 20% of global emissions by reducing food and other organic waste sent to landfill, alongside better sewage treatment. But the largest and most cost-effective cuts are to be made in the fossil fuel (oil, gas and coal) industries, which produce 35% of global methane.

Scientists working for the National Oceanic and Atmospheric Administration discovered that US gas and oil methane emissions were 60% higher than estimated, mostly due to leaky pipelines and other infrastructure. There are more than 900,000 oil and natural gas wells in the US, but an investigation by Reuters news agency estimated the number of abandoned wells at more than 3.2 million.

The IEA estimates the industry’s methane emissions could be reduced by 75%. And the Clean Air Task Force (CATF) says it can mostly be done at little or no cost to industry.

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