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Commentary: As carbon emissions rebound after COVID-19 dip, talk of building back better may ring hollow

Pandemic-induced lockdowns slashed global CO2 emissions, bringing about signs of environmental recovery. However, as economic activity resumed in 2021, emission levels grew, says NTU’s Benjamin Horton.

Commentary: As carbon emissions rebound after COVID-19 dip, talk of building back better may ring hollow
Smoke and steam rise from a coal processing plant in Hejin in central China's Shanxi Province. (AP Photo/Olivia Zhang, File)

SINGAPORE: The world has observed a 1.1 degrees Celsius temperature rise above pre-industrial levels, with feedback cycles and polar amplification resulting in a rise as high as 3 degrees Celsius in the Arctic.

The last decade was the hottest in 125,000 years.

Since the mid-1990s, we’ve lost around 28 trillion tonnes of ice which is causing sea levels to rise, with today’s melt rate standing at 1.2 trillion tonnes a year.

The World Bank estimates that if climate change is left unchecked, it will push 132 million people into poverty in the next decade and by 2050 displace more than 216 million people from their homes.

Scientists repeat the same data and alarming predictions time and again. We need to halve global carbon emissions by 2030 and reach net zero emissions by 2050.

But achieving these goals requires an effort unlike any that humanity has undertaken before. Meanwhile, poorer countries who have contributed the least to cumulative emissions have the most to lose from a changing climate.


In 2020, global carbon emissions fell more than 5 per cent due to COVID-19 and the resulting economic crisis.

(Photo: AFP/Saeed KHAN)

But any impact on carbon dioxide (CO2) concentrations – the result of cumulative past and current emissions – is in fact no bigger than the normal year-to-year fluctuations in the carbon cycle and the high natural variability in carbon sinks like vegetation.

Despite 2020's reverse trend, 2021 emissions are expected to again grow by nearly 5 per cent, to 33 billion tonnes.

CO2 concentrations are currently near 420 parts per million (ppm for short), setting a record high amount despite the ongoing pandemic.

The last time the Earth experienced a comparable concentration of CO2 was 3 million to 5 million years ago, when the temperature was 2 to 3 degrees Celsius warmer and sea level was 15 to 25 metres higher than now.


Climate change is driven by the combustion of fossil fuels, which contain carbon that plants pulled out of the atmosphere through photosynthesis over many millions of years. Fossil fuels are consumed at a rate of 171,000kg of coal, 11.6 million litres of gas, and 186,000 litres of oil per second.

In 2019, global carbon emissions from fossil fuels and industry reached a high of 36 billion tonnes.

The carbon-based fossil fuels are used for transportation, electrical generation, cement manufacturing and more. The climate crisis caused by carbon-based fuels is amplified by deforestation, agriculture, and many other practices.

Each year we pump more CO2 into the atmosphere than natural processes can remove, causing global emission levels to rise. Over the past 60 years, the annual rate of increase in atmospheric CO2 is roughly 100 times faster than the increases that occurred during the last ice age.

The total warming effect from human-generated greenhouse has increased by 45 per cent over 1990 to 2019.

Progress in mitigating this threat is intermittent at best, with CO2 emissions continuing to rise.


Given the astronomical amount of CO2 we emit yearly, structural changes to the economy are needed, and not just behavioural changes such as flying or driving less.

Most of the fall and subsequent rebound of CO2 emissions has come from road transport. Deserted streets and empty highways swiftly became the norm during lockdowns, as people were ordered to stay at home except for emergencies.

The actions that do make a difference include investment in renewable energy, low-carbon infrastructure, and plans to make buildings more energy efficient.

Renewable energy is becoming more and more affordable. The costs of solar and wind have fallen dramatically in recent years and will continue to do so.

Listen to how one Singaporean electricity retailer balances business with climate action and sustainability:

But even though we know what to do, the carbon intensity of the energy system has remained unchanged since 1990. Global fossil fuel consumption subsidies increased by 50 per cent from 2016 to 2018.

While coal-fired generation fell in 2020, the increases of the previous few years offsets this, rendering the level of coal generation no different from that of 2015.


The science of climate change describes a range of possible futures, which are largely dependent on the degree of action or inaction in the face of a warming world.

The policies implemented at COP26 will have far-reaching effects.

At COP26, governments had to make progress in closing three major gaps: A gap in targets to reduce emissions, a gap in rules to deliver and monitor progress, and a gap in financing climate solutions.

We expected leaders to agree to a step change in the pace and scale of climate action.

But based on nations that submitted targets, the world is now on track to warm 2.4 degrees Celsius since pre-industrial times by the end of this century.

World finance ministers at COP26 in Glasgow, Scotland on Nov 3, 2021. (Photo: Christopher Furlong/Getty Images Europe/POOL/AFP)

That is a far cry from the 2015 Paris climate deal overarching limit of 1.5 degrees Celsius or even its fallback limit of 2 degrees Celsius.

This was recognised in the final agreed COP26 document by including a pledge that revised (and more ambitious) plans for cutting emissions are to be submitted by each nation in a year’s time.

The COVID-19 pandemic is not a solution for climate change.

But the needed changes are economically affordable, technically possible and would affect our everyday life only marginally.

The world’s largest economies are spending trillions of dollars to help their economies recover from the COVID-19 pandemic but aren’t investing enough in a green recovery.

According to the latest UN Environment Programme Emissions Gap Report, of the US$16.7 trillion that has been spent globally to May 2021 on COVID-19 recovery packages, only US$438 billion is likely to reduce greenhouse gas emissions.

Halting the climate crisis is still possible if we scale up the global response. But the window is closing fast.

Armed with education about how the Earth works, if we act boldly and swiftly, if we set aside our political interests in favour of the air that our young people will breathe, and the food they will eat, and the water they will drink; if we think about them and their hopes and dreams, then we will act, and it won’t be too late.

Professor Benjamin Horton is Director of the Earth Observatory of Singapore and a professor at the Asian School of the Environment in Nanyang Technological University.

Listen to the author break down how climate change is destabilising oceans, and what that means for us:

Source: CNA/el


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