The last seven years (2015-2021) were the hottest ever recorded although the La Niιαa meteorological phenomenon led to a temporary drop in temperatures last year, the World Meteorological Organization (WMO) confirmed today.
“The seven warmest years have all been recorded since 2015, with 2016, 2019 and 2020 being first in the rankings,” the WMO said in a statement, noting that “for the seventh consecutive year, global temperatures have been exceeded. by more than 1 degree Celsius the pre-industrial levels “.
“Global warming and other long-term trends in climate change will continue due to record levels of greenhouse gas emissions into the atmosphere,” added the Geneva-based UN body.
La Niιαa is not enough
“Global warming in the long run, due to the increase in greenhouse gases, is now much more pronounced than the annual fluctuation of the average global temperature caused by natural climatic factors,” the Secretary-General said in a statement. of WMO Peteri Taalas.
Therefore, although successive occurrences of the La Niίνa phenomenon – which reappeared in late 2021 after its first appearance in 2020-2021 – caused a less significant rise in temperatures in 2021 than in recent years, in 2021 “it was even hotter than those affected by La Niιαa in the recent past,” Taalas explains.
The impact of La Niιαa, which occurs every two to seven years, is felt in much of the Earth in the form of fluctuations in atmospheric pressure, winds and rain, with consequences generally opposite to those of the other phenomenon, El Niιοo. .
In 2021, according to the WMO, the average temperature on the planet was therefore higher by about 1.11 degrees Celsius with a margin of error plus or minus 0.13 degrees from the pre-industrial levels, which cover the period 1850-1900.
The Paris Climate Agreement aims to limit the increase in the average global temperature to well below 2 degrees Celsius relative to pre-industrial levels and, if possible, to 1.5 degrees.
It will be remembered
For the most reliable statistics, the WMO compiles six major international datasets, most notably the US National Oceanic and Atmospheric Administration (NOAA) or even the European Center for Medium-Term Weather Forecasts (ECMWF) and its monitoring service. Copernicus, which published similar conclusions last week.
The WMO thus combines millions of meteorological and ocean observational data, including satellite, with other modeled values, to be able to “calculate temperatures at any time, anywhere in the world, even in areas where the observation grid is sparse, such as near poles “.
According to the various services based on the World Meteorological Organization, 2021 was the fifth warmest year ever recorded (Copernicus), with NOAA and Berkeley Earth ranking it sixth and Japan Meteorological Service seventh. .
In any case, “the year 2021 will be remembered for a record temperature of almost 50 degrees Celsius recorded in Canada – a temperature that can be compared to the rising prices in the Sahara in Algeria – remarkable rainfall and deadly floods in Asia and “Europe, as well as the occurrence of drought in some parts of Africa and South America,” recalls Taalas.
“The effects of climate change and the risks associated with meteorological conditions have had a devastating effect on populations on all continents,” the WMO Secretary-General concluded.
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