Scientists say Earth is hotter today than it has been for nearly all of the last 11,000 years
By Chris Gayomali, The Week, March 8, 2013
A new study published Thursday in the journal Science contains some eye-popping numbers regarding global temperature changes over the last few millennia. Per The Wall Street Journal:
New research suggests average global temperatures were higher in the past decade than over most of the previous 11,300 years, a finding that offers a long-term context for assessing modern-day climate change. [Wall Street Journal]
Previous climate research presented a much more condensed snapshot, stretching back 1,500 years max. According to The New York Times, these past studies also concluded “that the rapid temperature spike of the past century, believed to be a consequence of human activity, exceeded any warming episode during those years.”
But this new, expansive experiment—led by Oregon State’s Shaun Marcott—gives us a much wider scope of how Earth’s temperatures have changed.
“What’s different is the rate of change,” says Marcott. “What we’ve seen over the past 150 years is much greater than anything we saw in the past 11,000 years.” The team relied on proxy measurements from various sources to piece together a timeline of global temperature estimates—including readings from marine fossils, ice cores, and pollen levels.
So what does it all mean? According to the Journal: The decade 2000-2009 was one of the warmest since modern record-keeping began. … If the scientists’ forecasts are correct, the planet will be warmer in 2100 than it has been for 11,300 years. [Wall Street Journal]