Earth`s hot spell unlike anything in 11,000 years
Washington: A study has found that 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.
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 based on various fossil samples and other data collected from 73 sites around the world. Their studies have determined that the past 10 years have been hotter than 80 percent of the last 11,300 years.
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.
The lead author of the study ,Shaun Marcott commented "We already knew that on a global scale, Earth is warmer today than it was over much of the past 2,000 years".
"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," Marcott, further added.
The data shows 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.
(With Agency Inputs)
More from India
More from World
More from Sports
More from Entertaiment
- PM Narendra Modi's speech at Heart of Asia conference
- Like SAARC, should India boycott Pak in Heart of Asia conference?
- India-Afghanistan thrash Pakistan over terrorism issue in Heart of Asia conference
- Tamil Nadu CM Jayalalithaa's condition extremely grave
- Gujarat: Goods train engine catches fire in Surat
- Rs 14,000 crore default case: Gujarat businessman detained, says money belongs to politicians, babus
- Fake or Real? 'Alien animal' caught on Karnataka-Kerala border
- People want to know whether Jayalalithaa is alive or not; PM Narendra Modi must intervene, says expelled AIADMK MP Sasikala Pushpa
- Tamil Nadu CM Jayalalithaa's condition continues to remain critical after suffering cardiac arrest
- Jayalalithaa's health condition: Amma critical, nation's political fraternity expresses concern - Who said what