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

World Business

Climate change could raise cost of US allergies

(Xinhua)
Updated: 2010-04-14 16:53
Large Medium Small

WASHINGTON: Climate change could push the cost of US allergies and asthma beyond the current $32 billion annual price tag, conservation and health groups reported on Wednesday.

A warming planet makes for longer growing seasons that would produce more allergy-provoking pollen in much of the heavily populated eastern two-thirds of the United States, the National Wildlife Federation and the Asthma and Allergy Foundation of America said in their report.

Related readings:
Climate change could raise cost of US allergies US urged to step up climate bid
Climate change could raise cost of US allergies UN climate negotiators hammer out initial draft
Climate change could raise cost of US allergies Fewer Americans worried by climate change: survey
Climate change could raise cost of US allergies Global warming skepticism on rise in US

The cost of coping with allergies and allergen-driven asthma in the United States is at $32 billion in direct medical costs, lost work days and lower productivity, the report said.

"Climate change could allow highly allergenic trees like oaks and hickories to start replacing pines, spruces and firs that generally don't cause allergies, exposing many more people to springtime allergy triggers," said Amanda Staudt, a climate scientist at the wildlife federation.

Spring-like conditions are already arriving 14 days earlier than 20 years ago, Staudt said.

In the fall, ragweed plants will grow larger and more loaded with pollen over a longer growing season, Staudt said in a telephone interview. There is also evidence that ragweed, the biggest US allergy trigger, grows faster as carbon dioxide increases in the atmosphere.

Carbon dioxide, a greenhouse gas that spurs climate change, is emitted by human-made sources like fossil-fueled vehicles and coal-fired power plants as well as natural sources including human breath.

Carbon dioxide connection

"With more carbon dioxide, each ragweed plant can produce more pollen and can even produce more allergenic pollen, so fall allergies are going to get a pretty big hit," Staudt said.

The average global temperature last year tied for the second highest year on record and the decade from 2000-2009 was the hottest on record, according to NASA's Goddard Institute for Space Studies.

This means agricultural and natural growing zones are shifting northward, allowing pollen-bearing trees to survive over a wider range than they have historically, the report said.

About 10 million US residents have so-called allergic asthma, in which asthma attacks are triggered by pollen or other airborne allergens. These attacks are likely to increase as global warming causes these allergens to become more widespread, numerous and potent, the report said.

Poison ivy, one of the top 10 medically problematic plants in the United States with more than 350,000 cases of contact dermatitis reported annually, would become more toxic and more widespread as the climate changes. When exposed to more carbon dioxide, poison ivy plants produce a more allergenic form of urushiol, the substance that makes skin itch.

主站蜘蛛池模板: 亚洲欧美强伦一区二区 | 美国黄色大片 | 九九免费 | 一级裸体片 | 亚洲天堂中文字幕在线 | 亚洲色图25p | 男人的天堂官网 | 99成人免费视频 | 国内成人免费视频 | 99免费观看视频 | 青青青视频在线免费观看 | 日韩欧美中文字幕在线视频 | 亚洲欧美日韩第一页 | 亚洲精品1区 | 99色在线观看 | 黄色片免费 | 一区二区三区在线免费视频 | 玖玖在线观看 | 亚洲最大在线 | 美女国产网站 | 日韩中文字幕精品 | 99国产精品久久 | 欧美另类在线视频 | 欧美在线a| av免费在线网站 | 欧美成人免费一级人片100 | 在线看片中文字幕 | 久久看视频| 无码少妇一区二区三区 | 欧日韩av| 深夜av| 亚洲性夜 | 天堂av成人| 午夜视频欧美 | 美日韩精品 | 永久免费网站视频在线观看 | 婷婷四月 | 亚洲第一看片 | 999在线 | 国产成人精品一区二区三区在线观看 | 在线一二区 |