Earth on track to be hottest in 11.3 millennia—study
WASHINGTON—The Earth is on track to becoming the hottest it has been at any time in the past 11.3 millennia, a period spanning the history of human civilization, a study published Thursday has found.
Based on fossil samples and other data collected from 73 sites around the world, scientists have been able to reconstruct the history of the planet’s temperature from the end of the last Ice Age around 11,000 years ago to the present.
They have determined that the past 10 years have been hotter than 80 percent of the last 11,300 years.
But virtually all the climate models evaluated by the Intergovernmental Panel on Climate Change predict that the Earth’s atmosphere will be hotter in the coming decades than at any time since the end of the Ice Age, no matter what greenhouse gas emission scenario is used, the study found.
“We already knew that on a global scale, Earth is warmer today than it was over much of the past 2,000 years,” said Shaun Marcott, the lead author of the study, which was published in Science.
“Now we know that it is warmer than most of the past 11,300 years. This is of particular interest because the Holocene spans the entire period of human civilization,” said Marcott, who is a post-graduate researcher at Oregon State University.
The data show that temperatures cooled by 0.8 degrees Celsius over the past 5,000 years, but have been rising again in the past 100 years, particularly in the northern hemisphere where land masses and population centers are larger.
The climate models project that average global temperatures will rise by 1.1 to 6.3 degrees Celsius (2.0 and 11.5 degrees Fahrenheit) by the end of the century, depending on the level of C02 emissions resulting from human activities, the researchers found.
“What is most troubling is that this warming will be significantly greater than at any time during the past 11,300 years,” said Peter Clark, a paleoclimatologist at Oregon State.
The Earth’s position with respect to the Sun is the main natural factor affecting temperatures during that time, the scientists said.
“During the warmest period of the Holocene, the Earth was positioned such that Northern Hemisphere summers warmed more,” Marcott said.
“As the Earth’s orientation changed, Northern Hemisphere summers became cooler, and we should now be near the bottom of this long-term cooling trend—but obviously, we are not.”
Other studies have concluded that human activities—not natural causes—have been responsible for the warming experienced over the past 50 years.
Get Inquirer updates while on the go, add us on these apps:
Disclaimer: The comments uploaded on this site do not necessarily represent or reflect the views of management and owner of INQUIRER.net. We reserve the right to exclude comments that we deem to be inconsistent with our editorial standards.
To subscribe to the Philippine Daily Inquirer newspaper in the Philippines, call +63 2 896-6000 for Metro Manila and Metro Cebu or email your subscription request here.
Factual errors? Contact the Philippine Daily Inquirer's day desk. Believe this article violates journalistic ethics? Contact the Inquirer's Reader's Advocate. Or write The Readers' Advocate:
c/o Philippine Daily Inquirer Chino Roces Avenue corner Yague and Mascardo Streets, Makati City,Metro Manila, Philippines Or fax nos. +63 2 8974793 to 94