Long-term cooling ‘ended in 19th century’

2013-04-23 13:11

Multimedia   ·   User Galleries   ·   News in Pictures Send us your pictures  ·  Send us your stories

Washington – A global long-term cooling trend ended late in the 19th century and was followed decades later by the warmest temperatures in nearly 1 400 years, a sweeping study of temperature change showed.

The study, by a consortium of 78 authors in 24 countries, said its 2 000 years of data made it harder to discount the impact on higher temperatures of increased greenhouse gases due to human activity.

“Global warming that has occurred since the end of the 19th century reversed a persistent long-term global cooling trend,” the National Science Foundation, one of the study's sponsors, quoted the report as saying.


Researchers found that various factors, including fluctuations in the amount and distribution of heat from the Sun and increases in volcanic activity, fed an overall change in temperature patterns.

The researchers were part of 2K Network of the International Geosphere Biosphere Program's Past Global Changes (Pages) project. The research was published online on Sunday by the Nature Geoscience journal.

The National Science Foundation and the Swiss National Science Foundation jointly support the Pages office. The US agency called the study the most comprehensive evaluation of temperature change on the Earth's continents over the last 1 000 to 2 000 years.

The Pages study relied mainly on analysis of tree growth rings, pollen, skeletons of coral that register sea surface temperatures, polar and glacier ice samples and lake sediments, the National Science Foundation said.

Warmest century

The 20th century ranked as the warmest or nearly the warmest century on all the continents except Antarctica. Africa lacked enough data to be included in the analysis.

An abstract of the report on the Nature Geoscience website said that reconstructions of temperature showed generally cold conditions between 1580 and 1880. The trend was punctuated in some areas by warm decades in the 18th century.

From 1971 to 2000, the weighted average temperature was higher than any other time in nearly 1 400 years, it said.
Read more on:    washington  |  research  |  global warming

Join the conversation!

24.com encourages commentary submitted via MyNews24. Contributions of 200 words or more will be considered for publication.

We reserve editorial discretion to decide what will be published.
Read our comments policy for guidelines on contributions.

24.com publishes all comments posted on articles provided that they adhere to our Comments Policy. Should you wish to report a comment for editorial review, please do so by clicking the 'Report Comment' button to the right of each comment.

Comment on this story
Comments have been closed for this article.

Inside News24


Man scores date with tennis superstar after Twitter bet

It’s a modern day Cinderella story, but one American man took ‘shoot your shot’ seriously in 2017.


You won't want to miss...

6 myths about male cancer
Who are the highest paid models of 2017?
10 gorgeous plus-sized models who aren't Ashley Graham
5 top leg exercises for men
Traffic Alerts
There are new stories on the homepage. Click here to see them.


Create Profile

Creating your profile will enable you to submit photos and stories to get published on News24.

Please provide a username for your profile page:

This username must be unique, cannot be edited and will be used in the URL to your profile page across the entire 24.com network.


Location Settings

News24 allows you to edit the display of certain components based on a location. If you wish to personalise the page based on your preferences, please select a location for each component and click "Submit" in order for the changes to take affect.

Facebook Sign-In

Hi News addict,

Join the News24 Community to be involved in breaking the news.

Log in with Facebook to comment and personalise news, weather and listings.