Life Science Environment Greenhouse gases up despite ‘tiny blip’ of coronavirus lockdowns: WMO
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Greenhouse gases up despite ‘tiny blip’ of coronavirus lockdowns: WMO

The WMO believes any fall of greenhouse gas concentrations in 2020 would be a "tiny blip". Photo: AP
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Greenhouse gas concentrations rose again this year despite the world’s COVID-19 lockdowns, says the World Meteorological Organisation.

Many scientists expect the biggest annual fall in carbon emissions in generations this year as measures to contain coronavirus have grounded planes, docked ships and kept commuters at home.

However, the WMO described the projected 2020 drop as a “tiny blip” and said the resulting impact on the carbon dioxide concentrations that contribute to global warming would be no bigger than normal annual fluctuations.

“… In the short term the impact of the COVID-19 confinements cannot be distinguished from natural variability,” the WMO’s Greenhouse Gas Bulletin said.

The annual report released by the Geneva-based UN agency measures the atmospheric concentration of the gases – carbon dioxide, methane and nitrous oxide – that are warming our planet and triggering extreme weather events.

Levels of carbon dioxide, a product of burning fossil fuels that is the biggest contributor to global warming, touched a new record of 410.5 parts per million in 2019, it said.

“Such a rate of increase has never been seen in the history of our records,” WMO Secretary-General Professor Petteri Taalas said, referring to rises since 2015, calling for a “sustained flattening of the (emissions) curve”.

Global data is not yet available for 2020 but the trend of rising concentrations appears to be intact, the WMO said, citing initial readings from its Tasmania and Hawaii stations.

Like other scientific bodies, the WMO said it expects annual global carbon emissions to fall this year due to COVID measures, and ventured a preliminary estimate of between 4.2-7.5 per cent.

Such a drop would not cause atmospheric carbon dioxide to go down, but would slow the rate of increase temporarily on a scale that falls within normal variations, it said.

-AAP