The world has slightly less than 4 billion hectares of forests, covering about 30 percent of the world's land area.

全球现有略少于40亿公顷的森林，覆盖了约30%的全球土地面积。

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Supported by a special State fund and by local government coffers, the project is mainly aimed at covering impoverished urban households with a per capita housing area less than 4 SQM.

安居工程由国家安排的专项资金和地方自筹资金共同扶持，主要面向广大中低收入家庭，特别是对人均居住面积在4平方米以下的特困户。

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However, although the sea ice is shrinking -- covering less total area as well as becoming thinner -- the Arctic is still a world ruled by ice, a lesson well learned when the Polar Pioneer encountered heavy pack ice between Svalbard and the eastern coast of Greenland, forcing the captain to divert the boat and drop speed to just a few knots.

BBC: Life in the fragile, frozen Arctic