文档介绍：could be “unrecognizable”by 2050, experts say
专家:2050年地球或将面目全非
A growing, more affluent peting for ever scarcer resources could make for an "unrecognizable" world by 2050, researchers warned at a major US science conference Sunday.
The United Nations has predicted the global population will reach seven billion this year, and climb to nine billion by 2050, "with almost all of the growth occurring in poor countries, particularly Africa and South Asia," said John Bongaarts of the non-profit Population Council.
To feed all those mouths, "we will need to produce as much food in the next 40 years as we have in the last 8,000," said Jason Clay of the World Wildlife Fund at the annual meeting of the American Association for the Advancement of Science (AAAS).
"By 2050 we will not have a left that is recognizable" if current trends continue, Clay said.
The swelling膨胀population will exacerbate problems, such as resource depletion, said John Casterline, director of the Initiative in Population Research at Ohio State University.
But es are also expected to rise over the next 40 years -- tripling globally and quintupling in developing nations -- and add more strain to global food supplies.
上周日,研究人员在一个大型美国科学会议上警告说,随着地球人口越来越多,越来越富,人们对匮乏资源的争夺可能会导致地球到2050年变得“面目全非”。
联合国预测,全球人口今年将达到70亿,到2050年将达到90亿。非营利性组织人口理事会的约翰•邦戈兹说:“世界人口的增长基本都发生在贫穷国家,尤其是非洲和南亚地区的国家。”
在美国科学促进会的年度会议上,世界自然基金会的詹森•克莱说,要养活这