Study: Earth Warmer Than It Has Been In 120,000

| Educate!


A new study paints a picture of an Earth that is warmer than it has been in about 120,000 years, and is locked into eventually hitting its hottest mark in more than 2 million years.

As part of her doctoral dissertation at Stanford University, Carolyn Snyder , now a climate policy official at the U.S. Environmental Protection Agency, created a continuous 2 million year temperature record, much longer than a previous 22,000 year record. Snyder’s temperature reconstruction, published Monday in the journal Nature , doesn’t estimate temperature for a single year, but averages 5,000-year time periods going back a couple million years.

Snyder based her reconstruction on 61 different sea surface temperature proxies from across the globe, such as ratios between magnesium and calcium, species makeup and acidity. But the further the study goes back in time, especially after half a million years, the fewer of those proxies are available, making the estimates less certain, she said.

These are rough estimates with large margins of errors, she said. But she also found that the temperature changes correlated well to carbon dioxide levels.

Temperatures averaged out over the most recent 5,000 years — which includes the last 125 years or so of industrial emissions of heat-trapping gases — are generally warmer than they have been since about 120,000 years ago or so, Snyder found. And two interglacial time periods, the one 120,000 years ago and another just about 2 million years ago, were the warmest Snyder tracked. They were about 3.6 degrees (2 degrees Celsius) warmer than the current 5,000-year average.

With the link to carbon dioxide levels and taking into account other factors and past trends, Snyder calculated how much warming can be expected in the future.

Snyder said if climate factors are the same as in the past — and that’s a big if — Earth is already committed to another 7 degrees or so (about 4 degrees Celsius) of warming over the next few thousand years.

“This is based on what happened in the past,” Snyder said. “In the past it wasn’t humans messing with the atmosphere.”

Scientists give various reasons for past changes in carbon dioxide and heat levels, including regular slight shifts in Earth’s orbital tilt.

Four outside scientists praised the study’s tracking of past temperatures, with caveats about how less certain it is as it gets deeper in the past. Jeremy Shakun of Boston College said “Snyder’s work is a great contribution and future work should build on it.”

But many of the same scientists said Snyder’s estimate of future warming seems too high. Shakun called it unrealistic and not matching historical time periods of similar carbon dioxide levels.

A fifth scientist, Michael Mann of Pennsylvania State University, called the study provocative and interesting but said he remains skeptical until more research confirms it. He found the future temperature calculations “so much higher than prevailing estimates that one has to consider it somewhat of an outlier.”


  • DHFabian

    What we won’t discuss, and some even deny, is the impact of starting up millions of cars each day, with each of these cars adding soot and oil particles to the air. Many do require cars to get to work, shop, etc. Millions don’t, as they live in cities, but don’t wish to be inconvenienced by relying on public transportation. It would take tax dollars to create a modern, Euro-level mass
    transportation system, but we’re going to be stuck with war debts
    indefinitely. Americans do believe they have the right to drive as much as they can afford to drive. Nothing can destroy political careers like high prices and waiting lines at the gas stations.

  • TecumsehUnfaced

    Do you really think that if the ruling elite miraculously developed intelligent priorities replacing their predatory ones, they could persuade their propaganda fed subjects to move beyond Europe in regard to mass transportation.

    After all, in 1916 the most vicious of the ruling elite concocted a propaganda program that converted a peace-loving population into one idiotically crying for war with Germany.