对贝壳的同位素分析使得地质学家可以测量另一种冰川效应。
Isotopic analysis of shells allowed geologists to measure another glacial effect.
这会减弱温室效应并给同时使地球降温太快，以致每4万1千年因太阳的倾斜也不能提供足够的热量来融化这时期的冰川。
This could have weakened the greenhouse effect and cooled the Earth so much that the tilt towards the sun every 41,000 years no longer provided enough heat to melt the glaciers that formed in between.
21世纪中期，由于温室效应，南北极冰川融化，地球上很多城市被淹没。
The 21st century middle, because the greenhouse effect, the polar melting glaciers, earth many cities submerged.
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