GW-ND : brown clouds over Asia promoting global warming and a threat to the world

The top story on 14th of Nov about global warming :

The United Nations said Thursday, that a brown haze of soot, particles and chemicals is hanging over parts of Asia and is darkening the cities there. It is melting himalayan glaciers and is also making weather conditions more extreme.

These Hazes, officially known as atmospheric brown clouds, according to the scientists in this field, stretches from the Arabian Peninsula to China and the Western Pacific Ocean. Usually, these brown clouds, are three kilometres thick according to theresearchers.

These brown clouds are aggravating impact of climate change caused by greenhouse gases in some regions. This is according to the scientists from China, India, Europe and the U.S., this report was commissioned by the UN Environment Program.

Considering the brown hazes as a "serious and significant" environmental challenge being faced by the planet, which is also posing a threat to the human health and food production, the scientists said they are issuing a warning for it.

Achim Steiner, who is UN undersecretary general and executive director of the program, while addressing a news conference on the findings, said

1) "Imagine for a moment a three-kilometer-thick band of soot, particles, a cocktail of chemicals that stretches from the Arabic Peninsula to Asia."
2) "All of this points to an even greater and urgent need to look at emissions across the planet, because this is where the stories are linked in terms of greenhouse emissions and particle emissions and the impact that they're having on our global climate."

The brown clouds will be "dimming" the sunlight by as much as 25% in some places, with its impact on 13 major cities in Asia like Beijing, Shanghai, Bangkok, Cairo, Mumbai, New Delhi and Tehran.

These Black clouds, are mainly produced by the burning of fossil fuels, wood and plants, particles like black carbon, soot particles. These clouds gradually absorb the sunlight, and warm the air, consequently enhancing the greenhouse effect and the global warming.


The mask on warming due to brown clouds and melting of glaciers :

Most surprisingly, scientists have also predicted that these brown clouds will be able to "mask" the impact of global warming and its effect on climate change by an average of 40% because they contain particles that reflect sunlight and cool the earth's surface.

The studies reflects that the phenomenan has been closely observed only in Asia, but brown clouds have also been seen over parts of North America, Europe, southern Africa and the Amazon Basin.

Scientists have also predicted the negative impact of these clouds, which will mostly click the areas like, the degradation of air quality and agricultural production in Asia, with risks to human health increasing. Health problems associated with the brown clouds include cardiovascular and respiratory diseases.

The scientific panel that is carrying out the research, has its head namely Veerabhadran Ramanathan, who is also a professor at the Scripps Institution of Oceanography at the University of California in San Diego. He said that huge cloud masses is likely to cross continents in the span of three to four days. Also he added considering this issue, not a regional, but global one.
Ramanathan also said "The main message is that it's a global problem. This is not a problem where we point fingers at our neighbours. Everyone is in someone else's backyard."

Most seriously, the problem faced will be the melting of the Hindu Kush-Himalaya-Tibetan glaciers, which provide the head-waters for the major river systems viz. Ganges, Brahmaputra, Mekong and Yangtze rivers.

For example, the ganges basin has given shelter to more than 400 million people in India and also holds nearly 40% of indian irrigated croplands.

Ramanathan also said that the melting has "serious implications for the water and food security of Asia."

According to the studies performed in Chinese Academy of Sciences, since the 1950s, the glaciers have shrunk to nearly five per cent. Also, over the past quarter century, the volume of China's nearly 47,000 glaciers has fallen by 3,000 square kilometres.

The extreme conditions, that have developed due to these clouds, have helped reduce production of crops such as rice, wheat and soybean. They have also helped to decrease the monsoon season in India.

Ramanathan, while addressing, also couldn't deny his hope about the international response to the problems of greenhouse gases and brown clouds. He also hopes that the report "triggers" "unsustainable development" that underlies them both. He also added "The new research, by identifying some of the causal factors, offers hope for taking actions to slow down this disturbing phenomenon."