求翻译：全球变暖是指全球气温升高。近100多年来，全球平均气温经历了冷－暖－冷－暖两次波动，总的看为上升趋势。进入八十年代后，全球气温明显上升。是什么意思？

Global warming is global warming. Nearly 100 years, the average global temperature has experienced a cold - warm - cold - warm twice fluctuations In general upward trend. Into the 1980s, global temperatures increased significantly.

Global warming is referred to as global warming. Nearly 100 years, global average temperatures have been cold-warm-cold-warm two fluctuations, overall to an upward trend. After the 1980s, the global temperature has gone up significantly.

The whole world changes warm refers to the global temperature ascension.Nearly 100 for many years, the global average temperature has experienced the cold - warm - cold - warm two undulations, total looking at for trend of escalation.After enters for the 80's, global temperature obvious rise.

Global warming refers to the rise in global temperature. Last more than 100 years, global average temperatures have experienced cold-warm-cold-warm two swings, total look is on an upward trend. After the 80 's, a significant increase in global temperature.

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