你认为最大的全球性难题是什么？
课文中的全球性难题是什么？
在不少环境保护组织眼中，棕榈植物的种植一直被看作是棘手问题：不但导致亚洲野生动物栖息地不断缩小，而且还会产生全球性难题。
The charges against palm oil are serious: environmental groups regard it as a danger not only to Asian wildlife but also to the health of the planet.
奥巴马说：“以往面对类似全球性经济难题时，世界反应迟缓，人们付出了巨大代价。”
"Faced with similar global economic challenges in the past, the world was slow to act, and people paid an enormous price," said Mr. Obama.
水体富营养化问题已成为当今世界性的水污染治理难题，也是全球性的环境问题之一。
Eutrophication of water bodies has become a global and difficult problem in controlling water pollution and is one of the most important environmental problems.
水体富营养化问题已成为当今世界性的水污染治理难题，也是全球性的环境问题之一。
Eutrophication of water bodies has become a global and difficult problem in controlling water pollution and is one of the most important environmental problems.
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