Earth hasn't been this hot for more than 100,000 years

A new discussion paper by former senior NASA climate scientist James Hansen and 11 other experts published in the Earth System Dynamics journal reveals the steady rise of Earth's temperatures over the past 45 years means the planet is now as warm as it was during the interglacial Eemian period, which ended more than 115,000 years ago. Back then, Earth's sea levels were 20-30 feet higher than they are today and there was "much less ice," The Guardian reported.
While this paper has yet to be peer reviewed, its findings become all the more alarming when paired with the National Oceanic and Atmospheric Administration's latest warning. Last week, the NOAA said that carbon dioxide levels "will not drop below the symbolic 400 parts per million (ppm) mark in our lifetimes — the highest concentration of CO2 since the Pliocene era 3 million years ago," The Guardian reported.
In the Pliocene era, sea levels were a whopping 65 feet higher than they are today and there was so little ice near the north pole that trees were able to grow. Those conditions, NOAA scientist Bruce Bauer said, are a "bellwether for what future climate might be like."
The Week
Escape your echo chamber. Get the facts behind the news, plus analysis from multiple perspectives.

Sign up for The Week's Free Newsletters
From our morning news briefing to a weekly Good News Newsletter, get the best of The Week delivered directly to your inbox.
From our morning news briefing to a weekly Good News Newsletter, get the best of The Week delivered directly to your inbox.
A free daily email with the biggest news stories of the day – and the best features from TheWeek.com
-
Music reviews: Laufey, Deftones, and Earl Sweatshirt
Feature "A Matter of Time," "Private Music," and "Live Laugh Love"
-
'What's profitable today is not unification. It's segmentation.'
Instant Opinion Opinion, comment and editorials of the day
-
GPT-5: Not quite ready to take over the world
Feature OpenAI rolls back its GPT-5 model after a poorly received launch
-
China's Xi hosts Modi, Putin, Kim in challenge to US
Speed Read Chinese President Xi Jinping hosted Indian Prime Minister Narendra Modi, Russian President Vladimir Putin and other Asian leaders at an SCO summit
-
Russian strike on Kyiv kills 23, hits EU offices
Speed Read The strike was the second-largest since Russia invaded in 2022
-
UN votes to end Lebanon peacekeeping mission
Speed Read The Trump administration considers the UN's Interim Force in Lebanon (UNIFIL) to be a 'waste of money'
-
Israeli double strike on Gaza hospital kills 20
Speed Read The dead include five journalists who worked for The Associated Press, Reuters and Al Jazeera
-
China is silently expanding its influence in American cities
Under the Radar New York City and San Francisco, among others, have reportedly been targeted
-
Kyiv marks independence as Russia downplays peace
Speed Read President Vladimir Putin has no plans to meet with Zelenskyy for peace talks pushed by President Donald Trump
-
Trump halts Gaza visas as Israelis protest war
Speed Read Laura Loomer voiced her concerns over injured Palestinian kids being brought to the US for treatment and a potential 'Islamic invasion'
-
Russia tries Ukraine land grab before Trump summit
Speed Read The incursion may be part of Putin's efforts to boost his bargaining position