The Lethabo Power Station, a coal-fired power station owned by Eskom. Picture: REUTERS
The Lethabo Power Station, a coal-fired power station owned by Eskom. Picture: REUTERS

New York — Pandemic restrictions in 2020 caused the largest drop in carbon dioxide pollution from energy use since World War 2, but as lockdowns eased and economic activity picked up, emissions quickly resumed by year’s end.

In December, worldwide emissions were 2% higher than the same month in 2019, according to new data from the International Energy Agency.

Emissions from energy fell by about 2-billion tonnes, or 5.8% in 2020, from the prior year. Such a plunge “is without precedent in human history — broadly speaking, this is the equivalent of removing all of the EU’s emissions from the global total,” the authors wrote.

Both the US and EU saw emissions fall by 10%, with the steepest reductions concentrated in March, April, and May. China was the only large economy that saw emissions increase, by 0.8% on an annual basis. Much of that rise came towards the end of the year. China’s emissions were 7% higher in December 2020 than they were in December 2019.

The category with the biggest drop in energy-use emissions was transportation, as workers quarantined and business slowed or halted. The decline in oil use contributed more than half of the overall total, with half of that coming from road traffic and another 35% from grounded aircraft.

The bright spots — there were some — came in the renewables space. Electricity generated from the sun and wind reached a record 20% of the mix of global energy sources for the first time, and electric vehicles sold in record numbers.

While the world simultaneously struggles to return to normal and cut emissions permanently, the IEA is concerned about a post-pandemic CO₂ gusher. The speed with which energy demand returned as pandemic restrictions lifted “underscores the risk that CO₂ emissions will increase significantly this year”, the IEA wrote.

Scientists estimate that emissions would have to plummet by 10% for the year before scientists could detect the reduction in the CO₂ concentration of the atmosphere, which has risen every year for decades.



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