地质时期气候根据地质考察的各种证据（物质成分、沉积岩结构特点和生物化石等）推断的地球各地质时代的气候。又称古气候。
在整个地质时期，它们随着自然地气候循环减小或涨大。
Over geologic time, they have ebbed and flowed with natural climate cycles.
劳克林说，在讨论气候变化问题时，必须对比过去地质时期的情况。
You can't discuss climate change, Prof. Laughlin says, without looking backward across geologic time.
如果你察看一下撒哈拉的地质记录就会发现，每当气候变暖，温度超过现在，撒哈拉的绿洲便会在这一时期反复出现。
If you look at the geological records in the Sahara, there have been repeated periods where the Sahara was greener when temperatures were warmer than today.
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