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The following text is for question number 4-5.
Global warming is the increase in the average temperature of the Earth's near surface air and oceans since the mid twentieth century and its projected continuation.
The average global air temperature near the Earth's surface increased 0.74-0,18°C during the hundred years ending in 2005. The international panel on climate change (IPCC) concludes “most of observed increase in globally averaged temperatures since the mid twentieth century is likely due to the observed increase in anthropogenic (man made) greenhouse gas concentration via an enhanced green house effect. Natural phenomena such as solar variation combined with volcanoes probably had a small warming effect from pre industrial times to 1950 and a small cooling effect from 1950 onward.
What should we do after we know about global warming from this text?
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