![Current carbon dioxide levels last seen 14 million years ago](https://photo-cdn.urdupoint.com/images/UrduPoint-English-22.png)
Current Carbon Dioxide Levels Last Seen 14 Million Years Ago
Muhammad Irfan Published December 08, 2023 | 01:40 AM
![Current carbon dioxide levels last seen 14 million years ago](https://photo-cdn.urdupoint.com/images/UrduPoint-English-22.png)
Washington, (APP - UrduPoint / Pakistan Point News - 8th Dec, 2023) The last time carbon dioxide in the atmosphere consistently matched today's human-driven levels was 14 million years ago, according to a large new study Thursday that paints a grim picture of where Earth's climate is headed.
Published in the journal Science, the paper covers the period from 66 million years ago until the present, analyzing biological and geochemical signatures from the deep past to reconstruct the historic CO2 record with greater precision than ever before.
"It really brings it home to us that what we are doing is very, very unusual in Earth's history," lead author Baerbel Hoenisch of the Columbia Climate school's Lamont-Doherty Earth Observatory told AFP.
Among other things, the new analysis finds the last time the air contained 420 parts per million (ppm) of carbon dioxide was between 14-16 million years ago, when there was no ice in Greenland and the ancestors of humans were just transitioning from forests to grasslands.
That is far further back in time than the 3-5 million years that prior analyses have indicated.
Until the late 1700s, atmospheric carbon dioxide was about 280 ppm, meaning humans have already caused an increase of about 50 percent of the greenhouse gas, which traps heat in the atmosphere and has warmed the planet by 1.2 degrees Celsius compared to before industrialization.
"What's important is that Homo, our species, has only evolved 3 million years ago," said Hoenisch.
"And so our civilization is tuned to sea level as it is today, to having warm tropics and cool poles and temperate regions that have a lot of rainfall."
If global CO2 emissions continue to rise we could reach between 600 - 800 ppm by the year 2100.
Those levels were last seen during the Eocene, 30-40 million years ago, before Antarctica was covered in ice and when the world's flora and fauna looked vastly different -- for example huge insects still roamed the Earth.
Recent Stories
![Cricket: England v West Indies 3rd Test scoreboard](https://photo-cdn.urdupoint.com/media/2024/07/_1/235x155/pic_1722019914.jpg)
Cricket: England v West Indies 3rd Test scoreboard
![Finance minister briefs Chinese officials on refor ..](https://photo-cdn.urdupoint.com/media/2024/07/_1/235x155/pic_1722019922.jpg)
Finance minister briefs Chinese officials on reform agenda, engagement with IMF
![Finland says Russian vessel violated its territori ..](https://photo-cdn.urdupoint.com/media/2024/07/_1/235x155/pic_1722019912.jpg)
Finland says Russian vessel violated its territorial waters
![Olympic opening ceremony under way on River Seine](https://photo-cdn.urdupoint.com/media/2024/07/_1/235x155/pic_1722019266.jpg)
Olympic opening ceremony under way on River Seine
![West Indies' treble strike rocks England in third ..](https://photo-cdn.urdupoint.com/media/2024/07/_1/235x155/pic_1722019264.jpg)
West Indies' treble strike rocks England in third Test
![Ukraine court orders detention of suspect in murde ..](https://photo-cdn.urdupoint.com/media/2024/07/_1/235x155/pic_1722019262.jpg)
Ukraine court orders detention of suspect in murder of nationalist ex-MP
![Long queues, ticketing problems ahead of Paris ope ..](https://photo-cdn.urdupoint.com/media/2024/07/_1/235x155/pic_1722019015.jpg)
Long queues, ticketing problems ahead of Paris opening ceremony
![Rana Sanaullah Khan joins Paris 2024 Olympics inau ..](https://photo-cdn.urdupoint.com/media/2024/07/_1/235x155/pic_1722019638.jpg)
Rana Sanaullah Khan joins Paris 2024 Olympics inauguration reception
![Glowing tributes mark 69th birthday of President Z ..](https://photo-cdn.urdupoint.com/media/2024/07/_1/235x155/pic_1722019637.jpg)
Glowing tributes mark 69th birthday of President Zardari at Governor's House
![Players unaware of spying scandal as Canada Olympi ..](https://photo-cdn.urdupoint.com/media/2024/07/_1/235x155/pic_1722019635.jpg)
Players unaware of spying scandal as Canada Olympic coach sent home: official
![Naqvi hails Pak women cricketers for going down fi ..](https://photo-cdn.urdupoint.com/media/2024/07/_1/235x155/pic_1722019013.jpg)
Naqvi hails Pak women cricketers for going down fighting against SL
!['Sabotage' on French rail network before Olympics: ..](https://photo-cdn.urdupoint.com/media/2024/07/_1/235x155/pic_1722019634.jpg)
'Sabotage' on French rail network before Olympics: What we know
More Stories From World
-
Biden talks Gaza ceasefire efforts with king of Jordan
5 hours ago -
Sinaloa Cartel co-founder pleads not guilty after stunning US capture
5 hours ago -
Panama says Venezuela blocked ex-presidents going to observe polls
5 hours ago -
Ethiopia mourns victims of landslide tragedy
5 hours ago -
Khan Yunis fighting displaces 180,000 Gazans in four days: UN
5 hours ago -
Trump slams rivals as he meets Netanyahu in Florida
5 hours ago
-
Obama & his wife, Michelle, officially endorse US VP Kamala Harris for president
5 hours ago -
Rain, cooling slow huge blaze in Canada's Jasper park
5 hours ago -
Airbus and Boeing supremacy secure despite turbulence
5 hours ago -
S.African police detain 95 Libyans at suspected military camp
6 hours ago -
'Slapping therapist' guilty over UK diabetic woman's death
6 hours ago -
Panama says Venezuela blocked flight of ex-presidents going to observe polls
6 hours ago