Record Greenhouse Gas Levels Hit New Highs in 2024

 



In 2024, greenhouse gas levels reached a new high. The World Meteorological Organization (WMO) reported a rise of over 10% in just two decades. This surge is alarming. It marks the urgent need for action to combat climate change.

Key Greenhouse Gas Levels

The average global concentrations of key greenhouse gases in 2023 were:

  • Carbon dioxide (CO2): 420 parts per million (ppm)
  • Methane (CH4): 1934 parts per billion (ppb)
  • Nitrous oxide (N2O): 336.9 ppb

These levels are higher than in pre-industrial times:

  • CO2: 151% of pre-industrial levels
  • Methane: 265%
  • Nitrous oxide: 125%
Causes of the Increase

Several factors contributed to this increase: 

  • Large vegetation fires released substantial CO2.
  • Forests may have absorbed less carbon than before.
  • Fossil fuel emissions from human and industrial activities remained high.

These elements combined to drive greenhouse gas concentrations higher than ever before.

Impact of Emissions

The WMO Secretary-General, Celeste Saulo, brought to light the seriousness of the situation. The rising levels should alarm decision-makers. The world is off track to meet the Paris Agreement goals. These goals aim to limit global warming to well below 2 degrees Celsius and ideally to 1.5 degrees Celsius above pre-industrial levels.

Long-Term Trends

The increase of CO2 in 2024 was 2.3 ppm, marking the twelfth consecutive year with an increase greater than 2 ppm. Over the last 20 years, CO2 levels rose by 11.4%. In 2004, the level recorded was 377.1 ppm.

Radiative Forcing

From 1990 to 2023, radiative forcing from long-lived greenhouse gases increased by 51.5%. CO2 accounted for about 81% of this increase. Radiative forcing refers to the warming effect these gases have on our climate.

As emissions continue, greenhouse gases will keep accumulating in the atmosphere. This will lead to further increases in global temperatures. CO2 has a long atmospheric lifespan. Even if emissions are reduced to net zero, the temperature levels already observed will persist for decades.
Historical Context

The last time CO2 levels were comparable to today’s was 3-5 million years ago. During that period, global temperatures were 2-3 degrees Celsius higher. Sea levels were also 10-20 meters higher than they are now. This historical perspective underscores the potential consequences of current trends.

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