Increasing CO2 helps delay arrival of new ice age
Mankind's emissions of carbon dioxide and the resulting temperature increase could prove to be our salvation from the next ice age, a new research has suggested.
According to a research from the University of Gothenburg, Sweden, the current increase in the extent of peatland is having the opposite effect.
"We are probably entering a new ice age right now. However, we're not noticing it due to the effects of carbon dioxide," researcher Professor Lars Franzen said.
Looking back over the past three million years, the earth has experienced at least 30 periods of ice age, known as ice age pulses.
The periods in between are called interglacials.
The researchers believe that the Little Ice Age of the 16th to 18th centuries may have been halted as a result of human activity.
Increased felling of woodlands and growing areas of agricultural land, combined with the early stages of industrialisation, resulted in increased emissions of carbon dioxide which probably slowed down, or even reversed, the cooling trend.
"It is certainly possible that mankind's various activities contributed towards extending our ice age interval by keeping carbon dioxide levels high enough," Lars Franzen, Professor of Physical Geography at the University of Gothenburg, said.
"Without the human impact, the inevitable progression towards an ice age would have continued. The spread of peatlands is an important factor."
Peatlands act as carbon sinks, meaning that they absorb carbon dioxide from the atmosphere.
"By using the National Land Survey of Sweden's altitude database, we have calculated how much of Sweden could be covered by peatlands during an interglacial.
"We have taken a maximum terrain incline of three degrees as our upper limit, and have also excluded all lakes and areas with substrata that are unsuitable for peatland formation," he said.