Another important push was the onset of the Little Ice Age, a climatic phenomenon that led to cooler temperatures in the Northern Hemisphere.

另一个重要的推动因素是小冰期的开始，这一气候现象导致北半球气温下降。

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As planes push cloud temperatures past the tipping point at which supercooled water freezes, the aircraft "seed" the clouds with ice particles, the study says.

研究者称，飞机飞行将云温推至临界点以下，为那些过冷的液态水提供了云形成的冰颗粒，使其凝聚冻结。

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These icebergs push out into the 30-mile-long Ilulissat ice Fjord, and then into Disko Bay and eventually the North Atlantic ocean.

这些冰山先是推进至30英里长的伊卢利萨特冰峡湾，接着进入迪斯科湾，最后滑入北冰洋。

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However, if anyone can push ice hockey into the sporting mainstream in the UK, it is Philip Anschutz.

BBC: Dome doom or hockey history?

Added to the general atmospheric warming in the region, the researchers also describe an amplification process whereby reduced snow cover on the surrounding tundra and less sea-ice in the Arctic Ocean push up temperatures still further.

BBC: Canadian glaciers face 'big losses'

Her massive spruce timbers weigh 2, 000 pounds, but this is an elephant on ball bearings: A single person can push her across the ice.

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