Negative hands and dots tend to be one of the most frequent pairings, especially during a warm climate period known as the Gravettian.

凹下的手掌形和小圆点是最频繁出现的成对图形之一，尤其在温暖气候的葛拉夫特时期。

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Changes in climate before that period caused severe fluctuation in sea level, resulting in the extinction of the dinosaurs.

在此之前，气候的变化导致了海平面的剧烈波动，恐龙因此灭绝。

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These animals were not as sensitive to climate changes in the Cretaceous period as they are today.

这些动物在白垩纪对气候变化不像今天这样敏感。

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The selections, which span from 1918 to 1980 also feature recordings that capture the political climate of the period, including Jimmie Davis' You Are My Sunshine (1940) which became Davis' campaign song while running for governor in Louisiana.

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About 14 million years ago, a period of climate change caused the formation of the Antarctic ice sheet, which averages one mile in thickness and gets up to three miles thick in some parts.

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In 2003 Hansen wrote a widely distributed (but not peer reviewed) paper called Can We Defuse the Global Warming Time Bomb? in which he argues that human-caused forcings on the climate are now greater than the natural ones, and that this, over a long time period, can cause large climate changes.

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