Wednesday December 19, 2018
Home Science & Technology Humans to bla...

Humans to blame for Creation of World’s Largest hot Sahara Desert: Study

0
//
Hot Sahara Desert, Credits: Wikimedia
Republish
Reprint

Seoul, March 15, 2017: Challenging a commonly held theory that changes in the Earth’s orbit triggered Sahara desertification, a new study suggests that humans may have played an active role in the transition of a lush green landscape into the world’s largest hot desert thousands of years ago.

The desertification of the Sahara has long been a target for scientists trying to understand climate and ecological tipping points.

Most studies done to date point to changes in the Earth’s orbit or natural changes in vegetation as the major driving forces.

NewsGram brings to you current foreign news from all over the world. 

In a new paper published in the journal Frontiers in Earth Science, David Wright from Seoul National University in South Korea challenges the conclusions of these studies.

“In East Asia there are long established theories of how Neolithic populations changed the landscape so profoundly that monsoons stopped penetrating so far inland,” said Wright.

Evidence of human-driven ecological and climatic change has been documented in Europe, North America and New Zealand, said Wright who believed that similar scenarios could also apply to the Sahara.

To test his hypothesis, Wright reviewed archaeological evidence documenting the first appearances of pastoralism across the Saharan region, and compared this with records showing the spread of scrub vegetation, an indicator of an ecological shift towards desert-like conditions.

The findings confirmed his thoughts.

Beginning approximately 8,000 years ago in the regions surrounding the Nile River, pastoral communities began to appear and spread westward, increasing at the same time the spread of scrub vegetation, the study said.

NewsGram brings to you top news around the world today.

Growing agricultural addiction had a severe effect on the region’s ecology. As more vegetation was removed by the introduction of livestock, it increased the albedo (the amount of sunlight that reflects off the earth’s surface) of the land, which in turn influenced atmospheric conditions sufficiently to reduce monsoon rainfall.

The weakening monsoons caused further desertification and vegetation loss, promoting a feedback loop which eventually spread over the entirety of the modern Sahara, the study said. (IANS)

Click here for reuse options!
Copyright 2017 NewsGram

Next Story

European Union Agrees To Cut Greenhouse Gases Emission

EU countries are separately considering the extent to which truck emissions should be cut, with a debate due Thursday.

0
Emissions
In this slow-shutter zoom effect photo taken Dec. 12, 2018, commuters backed up in traffic during the morning rush hour, in Brussels, a city that regularly experiences pollution alert warnings. VOA

The European Union agreed Monday to a goal of cutting carbon emissions from cars by 37.5 percent in a decade, finally settling differences between vehicle-producing countries and environmentally-conscious lawmakers.

The 28-nation bloc has been divided for months over how strict to be on CO2 emissions from vehicles as part of its push to reduce greenhouse gases overall by 40 percent by 2030.

Germany, with the EU’s biggest auto sector worth some 423 billion euros ($480 billion) in 2017, had warned tough targets and the drive toward more electric cars could harm its industry and cost jobs.

Representatives of the European Parliament and the EU countries finally struck a compromise Monday, after nine hours of talks, to cut emissions from cars by 37.5 percent and vans by 31 percent by 2030 compared with 2021.

Climate, emissions
– Greenpeace activists wear white morphsuits as they stage an action against particulate matter and health burden caused by diesel exhaust in Stuttgart, southern Germany. VOA

There was also agreement on an interim target of a 15 percent cut for both cars and vans by 2025.

“This is an important signal in our fight against climate change,” said current EU president Austria’s Sustainability Minister Elisabeth Koestinger.

But Brussels-based green lobbying group Transport & Environment expressed disappointment the deal was not even more ambitious.

“Europe is shifting up a gear in the race to produce zero-emission cars. The new law means by 2030 around a third of new cars will be electric or hydrogen-powered,” said its clean vehicles director, Greg Archer. “That’s progress, but it’s not fast enough to hit our climate goals.”

The compromise was tougher than the original EU executive proposal of an emissions decline of 30 percent compared to 2021.

Climate change, emissions, Global Warming
U.N. Climate chief Patricia Espinosa (C) is flanked by officials during a press conference at the COP24 climate change summit in Katowice, Poland, VOA

Germany had endorsed that, but a push by several EU countries, including the Netherlands and France, raised the target for EU countries to 35 percent. The EU Parliament had wanted 40 percent, so in the end, they split the difference.

The German automobile association (VDA) said the new legislation would set high demands while doing little to promote or provide incentives for switching to electric vehicles.

EU countries were among nearly 200 that agreed Saturday to rules for implementing the 2015 Paris climate accord at a U.N. conference in Poland.

Also Read: Governments Have Failed to Respond Adequately to Climate Change at The U.N. Conference: Activists

“Today’s successful outcome is even more important in view of this weekend’s conclusions … in Katowice. It clearly shows, once again, our unwavering commitment to the Paris Agreement,” EU Climate Commissioner Arias Canete said.

EU countries are separately considering the extent to which truck emissions should be cut, with a debate due Thursday. (VOA)