这些国家可以通过开垦新的耕地来增加粮食产量。
These countries could presumably boost food output by taking in some new land.
20世纪初，普遍认为人类可以改变区域气候(比如，通过砍伐森林与开垦土地)，但对于全球气候还无能为力。
Early in the 20th century, the prevailing notion was that people could alter climates locally (for instance, by cutting down forests and ploughing virgin fields) but not globally.
欧盟委员会能源局说粮食作物的短缺可以从几个方面得到弥补，包括提高单产和开垦弃慌土地。
The European Commission's energy team says shortfalls in grain can be avoided in several ways, including by improving farming yields and cultivating abandoned land.
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