Countries that manage Antarctica are calling for limits on the number of tourist ships, for fortified hulls that can withstand sea ice and for a ban on the use of so-called heavy oils.

各个国家对于南极洲要求对于游览船只的限制采取了措施，一个是对抗海冰的船体外壳加固，另一个是禁止重油船。

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The previously off-limits sea ice data has a resolution of one meter.

先前禁入的海冰数据具有一米的分辨率。

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The clearing of sea ice will also permit oil-drilling in places hitherto off-limits.

海冰的融化还使得人们能够在原本无法开采石油的地方进行石油勘探、开采。

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Chile still has an unsettled border issue with Argentina, involving the limits of the southern Patagonian ice field.

BBC: Chile navy investigates 'xenophobia' in video

The second is that the planetary-boundaries group derives most of its limits by looking at conditions during the Holocene the epoch since the end of the most recent ice age, in which human civilisations have grown up.

ECONOMIST: The global environment