GENEVA — Four key climate
change indicators all set new record highs in 2021, the United Nations said
Wednesday, warning that the global energy system was driving humanity towards
catastrophe. Greenhouse gas concentrations, sea level rise, ocean heat and
ocean acidification all set new records last year, the
UN's World Meteorological Organization (WMO) said in its "State of the Global Climate
in 2021" report.
اضافة اعلان
The annual overview is "a
dismal litany of humanity's failure to tackle climate disruption", UN
chief
Antonio Guterres said. "The global energy system is broken and
bringing us ever closer to climate catastrophe." The WMO said human
activity was causing planetary-scale changes on land, in the ocean and in the
atmosphere, with harmful and long-lasting ramifications for ecosystems.
WMO chief Petteri Taalas said
the war in
Ukraine had been overshadowing climate change, which "is still
the biggest challenge we are having as mankind". The report confirmed the
past seven years were the top seven hottest years on record. Back-to-back La
Nina events at the start and end of 2021 had a cooling effect on global
temperatures last year. Even so, it was still one of the warmest years ever
recorded, with the average global temperature in 2021 about 1.11 degrees Celsius
above the pre-industrial level.
A picture taken from the Muharraq island shows a sandstorm engulfing the skyline of Bahrain’s capital Manama on May 18, 2022.
The
2015 Paris Agreement on climate change saw countries agree to cap global warming at "well
below" 2C above average levels measured between 1850 and 1900 -- and 1.5C
if possible. "All major climate indicators are quite frankly heading in
the wrong direction and without much greater ambition and urgency, we are about
to lose the narrow window of opportunity to keep the 1.5-degree goal
alive," Guterres' climate action advisor Selwin Hart told a press
conference.
Taalas said the climate was
changing "before our eyes". "The heat trapped by human-induced
greenhouse gases will warm the planet for many generations to come. Sea level
rise, ocean heat and acidification will continue for hundreds of years unless
means to remove carbon from the atmosphere are invented," he said.
Four key indicators of climate
change "build a consistent picture of a warming world that touches all
parts of the Earth system", the report said. Greenhouse gas concentrations
reached a new global high in 2020, when the concentration of
carbon dioxide (CO2) reached 413.2 parts per million globally, or 149 percent of the
pre-industrial level. Data indicate they continued to increase in 2021 and
early 2022, the report said.
Taalas reiterated Covid-19
lockdowns had had no impact on atmospheric greenhouse gases concentrations. Global
mean sea level reached a new record high in 2021, rising an average
of 4.5 millimetres per year throughout 2013 to 2021, the report
said.That is more than double the average annual rise of 2.1 mm per year
between 1993 and 2002, with the increase between the two time periods
"mostly due to the accelerated loss of ice mass from the ice sheets",
it said. Taalas said the melting of glaciers would raise sea levels for
hundreds or thousands of years to come, due to CO2 concentrations in the
atmosphere.
"This is a lost game
already," he said. Ocean heat hit a record high last year, exceeding the
2020 value, the report said. And it is expected the upper 2,000 metres of
the ocean will continue to warm in the future -- "a change which is
irreversible on centennial to millennial timescales", said the WMO. The
ocean absorbs around 23 percent of the annual emissions of human-caused CO2
into the atmosphere. While this slows the rise of atmospheric CO2
concentrations, CO2 reacts with seawater and leads to ocean
acidification.The
UN's
Intergovernmental Panel on Climate Change concluded
with "very high confidence" that open ocean surface acidity is at the
highest "for at least 26,000 years". "
We should take action
now," Taalas told AFP. "We are now heading 2.5 to three degrees
warming instead of 1.5, which would be best for our future. "It is better
to invest in climate-friendly technologies than to live with the consequences
of climate change that are going to be even 20 times more expensive if we
fail."
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