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U.N. releases blistering assessment on the state of climate change

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Environment


U.N. RELEASES BLISTERING ASSESSMENT ON THE STATE OF CLIMATE CHANGE

The sobering report found it "unequivocal that human influence has warmed the
atmosphere, ocean and land."
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03:51






 
U.N. report warns climate change is ‘code red for humanity’
03:52
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Aug. 9, 2021, 10:05 AM GMT+2 / Updated Aug. 9, 2021, 9:18 PM GMT+2
By Denise Chow and Helena Skinner

Climate change is changing Earth in ways that are "unprecedented" in thousands
of years — and in some cases, hundreds of thousands of years — according to a
blistering report released Monday by the United Nations.

The sobering assessment also found that some changes that are already playing
out, such as warming oceans and rising sea levels, are "irreversible for
centuries to millennia."





U.N. Secretary General António Guterres called the findings a "code red for
humanity," adding that the "alarm bells are deafening, and the evidence is
irrefutable."

The report is the most comprehensive assessment from the U.N.'s
Intergovernmental Panel on Climate Change (IPCC) since 2013 and provides the
strongest case yet for human-caused global warming, saying it's "unequivocal
that human influence has warmed the atmosphere, ocean and land."

The report also found that climate change is intensifying, occurring at an
accelerated pace and is already affecting every region of the planet.

"It has been clear for decades that the Earth's climate is changing, and the
role of human influence on the climate system is undisputed," Valérie
Masson-Delmotte, co-chair of the IPCC's Working Group I, said in a statement.



Ko Barrett, the IPCC’s vice- chair and a senior climate adviser at the National
Oceanic and Atmospheric Administration, told NBC News that the report shows that
no matter what humans do going forward, the future will be hotter than it is
now.



"It can be kind of demoralizing or depressing to think that there are so many
things that are kind of irreversible for a long period of time," Barrett said.
"But the good news is that, that these irreversible changes can be slowed down
with rapid, strong and sustained reductions in greenhouse gas emissions."

The IPCC, established in the late 1980s, consists of thousands of scientists
across 195 member governments who pore over the most recent published and
peer-reviewed research on global warming and compile the findings into a report
on the current state of the climate. The assessment, which includes a look at
the future risks and impacts of climate change, typically represents consensus
within the scientific community. More than 230 authors contributed to the latest
report.

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01:37
01:37






 

Scientists warn of climate change dangers as extreme weather hits the U.S.
01:37

The assessment comes less than three months before world leaders are set to
convene from Oct. 31 to Nov. 12 in Glasgow, Scotland, for the 2021 U.N. Climate
Change Conference. Countries are expected to set forth ambitious targets to
reduce emissions by 2030, and the IPCC's findings will likely feature
prominently in the discussions.

John Kerry, former secretary of state and the U.S. special presidential envoy
for climate, said in a statement that the report should compel leaders to take
aggressive action to put the planet on a path toward net zero emissions by
midcentury.

"What the world requires now is real action. All major economies must commit
to aggressive climate action during this critical decade," he said. "We can get
to the low carbon economy we urgently need, but time is not on our side."



The report states that greenhouse gas emissions from human activities have
caused global warming at a rate not seen in at least the past 2,000 years. It's
estimated that human-caused climate change is responsible for approximately 1.1
degrees Celsius of warming since 1850-1900, the earliest period with reliable
measurements of global surface temperatures, the authors wrote.

What's more, the report found that global temperatures are expected to exceed 2
degrees Celsius of warming this century "unless deep reductions in [carbon
dioxide] and other greenhouse gas emissions occur in the coming decades."

"The report makes it very clear: If we want to limit warming to any level that
is sort of manageable, you have to just cut back the emissions very deeply and
immediately," said Corinne Le Quéré, a professor of climate change science at
the University of East Anglia in the U.K., who was not involved with the IPCC
assessment.


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While the findings are grim, she said, "the responsibility to act is in our
hands."

Climate scientists have warned that the increase in average global temperatures
should be limited to under 2 degrees Celsius, or 3.6 degrees Fahrenheit, in
order to avoid the most devastating effects of global warming. The 2-degree
benchmark was set by climate negotiators in Copenhagen in 2009, but studies have
increasingly found that the target may already be out of reach.

Download the NBC News app for breaking news and politics 



In a news briefing Monday, Inger Andersen, under-secretary-general of the United
Nations and executive director of the United Nations Environment Programme, said
the IPCC has been warning of the dangers of climate change for more than three
decades, but that countries — especially the world's biggest economies that are
responsible for the bulk of greenhouse gas emissions — haven't done enough to
address the problems.

"The world listened, but it didn’t hear," she said. "The world listened, but it
didn’t act strongly enough. As a result, climate change is a problem that is
here, now. Nobody is safe. And it is getting worse faster."

The new IPCC assessment goes further than any of the group's previous reports in
linking human-caused climate change with increases in extreme weather events
around the world.

"It is virtually certain that hot extremes (including heat waves) have become
more frequent and more intense across most land regions since the 1950s, while
cold extremes (including cold waves) have become less frequent and less severe,"
the authors wrote, adding that human-caused global warming is the "main driver"
of those changes.

Recent events, including widespread drought in the western U.S., heat waves
across Europe and North America and devastating wildfires in Greece, Turkey and
the U.S., have highlighted the consequences of a warming world.

"The climate is behaving like an athlete on steroids," said Erich Fischer, a
climate scientist at ETH Zürich and one of the authors of the IPCC assessment.



The report also details how the increasing ocean and surface temperatures will
cause myriad physical changes in climate — including drought, heat waves, heavy
rainfall and coastal flooding — in different regions of the planet.

The assessment is part of the IPCC's latest summary on climate change, called
the Sixth Assessment Report or AR6, that will be published next year. The full
report consists of four sections: the Working Group I report on the science of
climate change; the Working Group II report on the vulnerabilities and
socioeconomic impacts; the Working Group III report on possible ways to mitigate
climate change; and the Synthesis Report, which reviews the findings from all
the working groups and integrates relevant information for policymakers.


Denise Chow

Denise Chow is a science and space reporter for NBC News.

Helena Skinner

Josh Lederman contributed.


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