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Earth has a fever: 2010 was the hottest decade ever measured in the past 11,500 years
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  • Earth has a fever: 2010 was the hottest decade ever measured in the past 11,500 years

Earth has a fever: 2010 was the hottest decade ever measured in the past 11,500 years

The Associated Press • January 16, 2020, 09:30:33 IST
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scientists said they see no end to the way man-made climate change keeps shattering records.

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Earth has a fever: 2010 was the hottest decade ever measured in the past 11,500 years

The decade that just ended was by far the hottest ever measured on Earth, capped off by the second-warmest year on record, two U.S. agencies reported Wednesday. And scientists said they see no end to the way man-made climate change keeps shattering records.

“If you think you’ve heard this story before, you haven’t seen anything yet,” Gavin Schmidt, director of NASA’s Goddard Institute for Space Studies, said at the close of a decade plagued by raging wildfires, melting ice and extreme weather that researchers have repeatedly tied to human activity.

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[caption id=“attachment_7912931” align=“alignnone” width=“1280”] The decade that just ended was by far the hottest ever measured on Earth, capped off by the second-warmest year on record, NASA and the National Oceanic and Atmospheric Administration reported. Image credit: AP The decade that just ended was by far the hottest ever measured on Earth, capped off by the second-warmest year on record, NASA and the National Oceanic and Atmospheric Administration reported. Image credit: AP[/caption]

Schmidt said Earth as a whole is probably the hottest it has been during the Holocene — the past 11,500 years or so — meaning this could be the warmest period since the dawn of civilization. But scientists’ estimates of ancient global temperatures, based on tree rings, ice cores and other telltale signs, are not precise enough to say that with certainty.

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The 2010s averaged 58.4 degrees Fahrenheit (14.7 degrees Celsius) worldwide, or 1.4 degrees (0.8 C) higher than the 20th-century average and more than one-third of a degree (one-fifth of a degree C) warmer than the previous decade, which had been the hottest on record, according to the National Oceanic and Atmospheric Administration.

The decade had eight of the 10 hottest years on record. The only other years in the top 10 were 2005 and 1998.

NASA and NOAA also calculated that 2019 was the second-hottest year in the 140 years of record-keeping. Five other global teams of monitoring scientists agreed, based on temperature readings taken on Earth’s surface, while various satellite-based measurements said it was anywhere from the hottest year on record to the third-hottest.

Several scientists said the coming years will be even hotter, knocking these years out of the record books.

[caption id=“attachment_7912941” align=“alignnone” width=“1001”]A graphic showing the rise in temperatures globally. Image credit: AP A graphic showing the rise in temperatures globally. Image credit: AP[/caption]

“This is going to be part of what we see every year until we stabilize greenhouse gases” from the burning of coal, oil and gas, Schmidt said.

“It’s sobering to think that we might be breaking global temperature records in quick succession,” said Georgia Tech climate scientist Kim Cobb. “2020 is off to a horrifying climate start, and I fear what the rest of the year will bring to our doorsteps.”

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NASA’s Schmidt said that overall, Earth is now about 1.2 degrees C hotter since the beginning of the industrial age, a number that is important because in 2015 global leaders adopted a goal of preventing 1.5 C of warming since the rise of big industry in the mid- to late 1800s. He said that shows the global goal can’t be achieved. (NOAA and the World Meteorological Organization put the warming since the dawn of industry slightly lower.)

“We have strong human-induced global warming,” said Friederike Otto, a climate scientist at the University of Oxford. “What we observe here is exactly what our physical understanding tells us to expect and there is no other explanation.”

Other explanations that rely on natural causes — extra heat from the sun, more reflection of sunlight because of volcanic particles in the atmosphere, and just random climate variations — “are all much too small to explain the long-term trend,” Princeton University climate scientist Michael Oppenheimer said.

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[caption id=“attachment_7912951” align=“alignnone” width=“1000”]boys on their way to play cricket walk through a dried patch of Chandola Lake in Ahmadabad, India. Image credit: AP boys on their way to play cricket walk through a dried patch of Chandola Lake in Ahmadabad, India. Image credit: AP[/caption]

Scientists said the decade-long data is more telling than the year-to-year measurements, where natural variations such as El Nino, the periodic warming of the Pacific Ocean, come into play.

“Human-caused climate change is responsible for the long-term warming — it’s responsible for why the 2010s were warmer than 2000s, which were warmer than the 1990s, etc.,” Texas A&M University climate scientist Andrew Dessler said in an email. “But humans are not responsible for why 2016 was warmer than 2015 or why 2019 was warmer than 2018.”

NOAA said the average global temperature in 2019 was 14.85 C, or just a few hundredths of a degree behind 2016, when the world got extra heat from El Nino. That’s 1.71 degrees (0.95 C) higher than the 20th-century average and 1.16 C warmer than the late 19th century.

Parts of Europe, Asia, Australia, Africa and South America had record-high temperatures in 2019, as did Alaska, New Zealand and New Mexico, NOAA said. Alaska was 6.2 degrees warmer than average, at 32.2 F. It was the first time in recorded history that Alaska’s average annual temperature was above freezing.

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The United States, which had only its 34th-warmest year, was nevertheless hit by 14 weather disasters that caused $1 billion or more in damage last year, according to NOAA.

Globally the past five years stand out as the hottest five on record, nearly 1.7 degrees (0.9 C) warmer than the 20th-century average. The last year Earth was cooler than the 20th century average was 1976, before Democratic presidential candidate Pete Buttigieg, French President Emmanuel Macron and Donald Trump Jr. were born.

[caption id=“attachment_7912971” align=“alignnone” width=“1000”]NOAA map shows the regional temperature departures from average for 2019. Image credit: AP NOAA map shows the regional temperature departures from average for 2019. Image credit: AP[/caption]

If you want to know what this means for people and the world, just look at wildfire-stricken Australia, Schmidt and others said.

Global warming is already being seen in heatwaves, ice sheet melt, more wildfires, stronger storms, flood-inducing downpours and accelerating sea-level rise, said Hans-Otto Portner, who heads the U.N. Intergovernmental Panel on Climate Change team that looks at the impact of climate change.

Sea ice both in the Arctic and Antarctic reached their second-lowest levels in 40 years of monitoring, NOAA reported.

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Dr. Renee Salas, a Boston emergency room physician and Harvard professor who studies climate change’s effects on health, said “these temperatures are not just statistics but have names and stories,” mentioning a construction worker and an elderly man with no air conditioning who were her patients this summer.

“The planet has a fever,” Salas said, “and that’s its symptom.”

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climate change Nasa Global warming Droughts El Nino NOAA warming climate crisis rise in temperatures year to year measurements of temperatures
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