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 civilisation, a study published on 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 per cent 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.
“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 civilisation,” said Marcott, who is a post-graduate researcher at Oregon State University.
The data show that temperatures cooled by 0.8ºC 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 centres are larger. The climate models project that average global temperatures will rise by 1.1ºC to 6.3ºC 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.