日批在线视频_内射毛片内射国产夫妻_亚洲三级小视频_在线观看亚洲大片短视频_女性向h片资源在线观看_亚洲最大网

Podcast

Cloud-seeding safe, experts explain


Updated: 2011-02-17 13:37
Large Medium Small

Get Flash Player

進入英語學習論壇下載音頻   去聽寫專區一展身手

With efforts to manipulate the weather and induce precipitation intensifying because of the drought that has hit much of China, atmospheric experts have been reassuring the public that the release of chemicals into the sky will not hurt the environment.

"The impact of weather manipulation can be ignored because the dose of the catalyst is too small to cause a problem," said Lei Hengchi, a professor specializing in weather intervention at the Institute of Atmospheric Physics under the Chinese Academy of Sciences.

While silver iodide - the most common catalyst used to encourage clouds to discharge their water - is considered a hazardous substance and a toxic pollutant, the quantities used are not large enough to have any effect on the environment, he explained.

China has discharged silver iodide, dry ice and liquefied nitrogen into clouds from aircraft or from stations on the ground to enhance precipitation in dry regions since the 1950s.

Dry ice and liquefied nitrogen have absolutely no effect on the environment, People's Daily quoted Wang Guanghe, deputy director of the artificial weather intervention center under the China Meteorological Administration, as saying on Wednesday.

Wang said they turn into carbon dioxide and nitrogen, elements that are ordinarily found in the air. Wang agreed that the quantities of silver iodide being used are too small to have an impact, even thought he said the substance is considered toxic.

Lei added that experiments failed to find any silver iodide in Huairou Reservoir, on the outskirts of Beijing, after silver iodide was dispersed into clouds upstream of it.

Beijing burned more than 2,000 silver iodide rods at weather manipulation stations to enhance recent snowfalls on the city. About 6.5 kilograms of silver iodide in total was involved.

The silver iodide was dispersed in a 10,000-square-kilometer area, meaning about 1.3 grams was used for every square kilometer, Beijing Times quoted Zhang Qiang, head of the capital's artificial weather intervention office, as saying on Wednesday.

"Such a small dose cannot make an impact on the environment," Zhang said.

In order to relieve the drought that has continued since October, China had carried out nearly 2,200 weather control measures as of Monday aimed at encouraging precipitation, according to the latest statistics from weather.com.cn.

去聽寫專區一展身手

(中國日報網英語點津 Helen 編輯)

Cloud-seeding safe, experts explain

About the broadcaster:

Cloud-seeding safe, experts explain

Lee Hannon is Chief Editor at China Daily with 15-years experience in print and broadcast journalism. Born in England, Lee has traveled extensively around the world as a journalist including four years as a senior editor in Los Angeles. He now lives in Beijing and is happy to move to China and join the China Daily team.

分享按鈕
主站蜘蛛池模板: 亚洲美女黄色 | 成人看片黄a免费看视频 | 日本a级黄色 | www.激情五月| 久久免费看 | 91精品免费看| 影音先锋成人在线 | 亚洲狠狠干 | 在线成人免费视频 | 国产成年人免费视频 | 蜜臀av粉嫩av懂色av | 日本少妇久久 | 91热视频| 人人干网站 | 欧美一级二级三级视频 | 爱爱短视频 | 中文字幕高清在线 | 婷婷俺也去| 天堂中文字幕在线 | 久久久成人精品 | 欧美日韩在线观看一区 | 亚洲综合第一页 | 91黄色免费 | 亚洲狠狠 | 免费又黄又爽又猛大片午夜 | 日本色www | 自拍偷拍欧美亚洲 | 国产精品网页 | 中文字幕18 | 亚洲精品久久久久久久久久久久久 | 久久综合亚洲 | 亚洲午夜视频在线观看 | a在线观看免费 | 91视频88av| 日韩激情网站 | 国产精品自拍网站 | 国产一区成人 | 91热在线| 欧美日韩中文 | 美日韩视频 | 久久久久久影视 |