久久久无码人妻精品无码_6080YYY午夜理论片中无码_性无码专区_无码人妻品一区二区三区精99

 
  | Home | News| Living in China| SMS | About us | Contact us|
   
 Language Tips > 2004
AGRICULTURE REPORT - Calls for a 'Gene Revolution'
By Mario Ritter


This is Steve Ember with the VOA Special English Agriculture Report.

There are sixty-eight million hectares of genetically engineered crops. This is about five percent of all cropland in the world, and expanding. But debate over how best to use this biological technology continues.

Experts compare the rise of biotechnology to the period of change in the nineteen-sixties and seventies. The Green Revolution produced the modern systems and chemicals of agriculture. Productivity increased in many countries.

Today, the United Nations and others are calling for a Gene Revolution. Experts say the world must find new ways to fight hunger and feed its growing population.

But, unlike the Green Revolution, biotechnology has been supported mainly by private investment. Businesses are unwilling to share trade secrets with countries that do not recognize their property rights. Companies also want to earn a profit, so they develop crops for large markets.

Ninety-nine percent of genetically engineered crops are either soybeans, corn, cotton or canola. The U.N. Food and Agriculture Organization says little research has been done on food crops like wheat, rice, potatoes and cassava. An F.A.O. report last month expressed concern that biotechnology is not helping developing nations.

Six countries grew ninety-nine percent of all biotech crops last year: Argentina, Brazil, Canada, China, South Africa and the United States. Almost all these crops have special genes to resist damage by insects or by chemicals used to kill unwanted plants. The F.A.O. says there is little research on biotech plants that could resist crop failure in poor countries, or provide extra vitamins.

Director-General Jacques Diouf says scientists generally agree that foods made from genetically engineered crops are safe to eat. But he adds that little is known about their long-term effects. He also says there is less scientific agreement on the environmental effects, so each product must be carefully observed.

Public opinion is a big issue in the debate. Opponents say there may be unknown health dangers. Some poor nations have refused any food aid that contains genetically engineered products.

Yet the industry has had some successes recently. Last month the European Union ended a six-year suspension of approval for new biotech foods. And Brazil has been moving to let farmers plant genetically engineered soybeans.

This VOA Special English Agriculture Report was written by Mario Ritter. This is Steve Ember.

 
Go to Other Sections
Story Tools
 
Copyright by chinadaily.com.cn. All rights reserved

版權(quán)聲明:未經(jīng)中國(guó)日?qǐng)?bào)網(wǎng)站許可,任何人不得復(fù)制本欄目?jī)?nèi)容。如需轉(zhuǎn)載請(qǐng)與本網(wǎng)站聯(lián)系。
None of this material may be used for any commercial or public use. Reproduction in whole or in part without permission is prohibited.
 

 

久久久无码人妻精品无码_6080YYY午夜理论片中无码_性无码专区_无码人妻品一区二区三区精99

    日韩人妻精品无码一区二区三区| 苍井空浴缸大战猛男120分钟| 17c丨国产丨精品视频| 美女日批免费视频| 视频二区在线播放| 国产成人亚洲综合无码| 日韩视频免费在线播放| 99re6这里有精品热视频| 精品少妇无遮挡毛片| 欧美国产视频一区| 中文字幕中文在线| 日韩精品―中文字幕| 99精品视频网站| 国产精品人人妻人人爽人人牛| 午夜在线视频免费观看| 免费观看成人在线视频| h无码动漫在线观看| 亚洲精品永久视频| 久久精品一区二| 成人性生活视频免费看| 超碰中文字幕在线观看| 动漫av免费观看| 欧美日韩一道本| 日韩一级免费片| 欧美极品欧美精品欧美图片| 无码人妻精品一区二区蜜桃百度| 最近中文字幕一区二区| 女人扒开屁股爽桶30分钟| 2022中文字幕| 五月天综合婷婷| 中文字幕成人在线视频| 久草综合在线观看| 免费成人午夜视频| 免费人成在线观看视频播放| 亚洲第一页在线视频| 制服丝袜综合网| 日本中文字幕高清| www.xxx亚洲| 日韩av在线综合| 欧美a v在线播放| 成人免费视频91| 亚洲人成无码网站久久99热国产| www.国产二区| 亚洲av综合色区| 四虎影院一区二区| 吴梦梦av在线| 秋霞在线一区二区| 特色特色大片在线| 国产一二三四五| 真人做人试看60分钟免费| 无码人妻精品一区二区三区99v| 三级黄色片免费看| 欧美精品一区二区性色a+v| 在线免费黄色小视频| 日本特黄在线观看| 中文字幕综合在线观看| 精品少妇人妻av一区二区| 国产av第一区| 欧美 亚洲 视频| 欧美图片激情小说| 黄色一级片播放| 日本xxxxxxx免费视频| 久久久久久久少妇| 亚洲xxxx2d动漫1| 日韩av.com| 中文字幕制服丝袜在线| 美女黄色片网站| 国产爆乳无码一区二区麻豆| 日本香蕉视频在线观看| 蜜桃传媒一区二区三区| 97在线播放视频| 久久99爱视频| 久久免费一级片| 国产手机免费视频| 黄在线观看网站| 色播五月综合网| 一本—道久久a久久精品蜜桃| 法国空姐在线观看免费| 欧美a级免费视频| www.浪潮av.com| 视频在线观看免费高清| 亚洲免费视频播放| 精品丰满人妻无套内射| 日韩手机在线观看视频| 伊人网在线综合| 久久福利一区二区| 国产精品一区二区免费在线观看| 九色91popny| 97超碰国产精品| 青青草原av在线播放| 日韩成人av免费| 欧美精品卡一卡二| 青青青国产在线视频| 永久av免费在线观看| 亚洲 高清 成人 动漫| mm131亚洲精品| 青青草国产免费| 91极品视频在线观看| 大地资源网在线观看免费官网| 每日在线观看av| 岛国毛片在线播放| jizzjizz国产精品喷水| 日本黄色的视频| 国产免费黄色小视频| 亚洲色图偷拍视频| 天天夜碰日日摸日日澡性色av| 色悠悠久久综合网| 夜夜添无码一区二区三区| 一本岛在线视频| 日本福利视频一区| 国内自拍第二页| 成年网站在线免费观看| 中文字幕精品在线播放| 国产精品wwwww| 国产精品成人久久电影| 污污视频在线免费| 那种视频在线观看| 久久福利一区二区| 亚洲18在线看污www麻豆| 欧美成人一区二区在线观看| 水蜜桃在线免费观看| 亚洲精品午夜在线观看| 亚洲熟女乱色一区二区三区| 干日本少妇视频| 欧美午夜精品理论片| 成年人视频在线免费| 久久av综合网| 中文字幕综合在线观看| 亚洲三级视频网站| 青草青青在线视频| 五月天色婷婷综合| 亚洲高清在线不卡| 天天色综合天天色| 欧美精品色婷婷五月综合| 日本阿v视频在线观看| 国产成年人在线观看| 久久久久久久久久一区| 福利在线一区二区三区| 男人揉女人奶房视频60分| 日韩国产成人无码av毛片| 波多野结衣激情| 中文av字幕在线观看| 日韩av片网站| 美女一区二区三区视频| aaa毛片在线观看| 亚欧无线一线二线三线区别| 成人一级生活片| 青青青青在线视频| 国产精品无码免费专区午夜| www.-级毛片线天内射视视| 伊人国产精品视频| 一级做a爱视频| 中文字幕剧情在线观看| 中文字幕1234区| 久久久久久久高清| 国产九九九视频| 国产大片一区二区三区| 91 视频免费观看| 亚洲欧美aaa| 日韩av在线中文| 污网站在线免费| 伊人色在线视频| 亚洲综合伊人久久| 黄色免费高清视频| 潘金莲一级淫片aaaaaa播放1| 三级黄色片播放| 妞干网这里只有精品| 国产一级大片免费看| 国产精品入口芒果| 亚洲午夜精品久久久久久人妖| 日韩国产欧美亚洲| 欧美日韩中文在线视频| 青青青国产在线视频| 亚洲精品综合在线观看| 好吊色这里只有精品| 日本高清视频免费在线观看| 黄色片免费在线观看视频| 国产av人人夜夜澡人人爽麻豆| 男女激情免费视频| 精品一卡二卡三卡| 日日噜噜噜噜久久久精品毛片| 色悠悠久久综合网| 手机看片日韩国产| 久久这里只有精品23| 999在线免费视频| 91pony九色| 欧美一区二区视频在线播放| 成 年 人 黄 色 大 片大 全| 日韩久久一级片| 在线免费看v片| 国产爆乳无码一区二区麻豆| 国产乱子夫妻xx黑人xyx真爽| 日韩一区二区三区不卡视频| 小说区视频区图片区| 日本韩国欧美在线观看| 成年人在线观看视频免费| 亚洲AV无码成人精品一区| 三上悠亚久久精品| 久久婷婷综合色| 激情六月天婷婷|