The fact is, the allegation of scientists don't reach an agreement.
There are some allegation.
1. Global Warming goes very high pace.
2. Global Warming goes slowly.
3. It is natural change of climate.
These differences caused by mainly two reason.
A. The effect of aerosols
In atmosphere, there are many aerosols like cloud. And they have the cooling effect for earth. But the strength of cooling effect of them isn't cleared and there is a disagreement about it among scientist.
B. The periodicity of climate
In our world, many things have periodicity. (ex. element, economy and so on)
Climate also has periodicity and it is said the world is in the warm age now and, within a few years, it changes into cooling age.
So, there is a allegation that we should wait the measurement of these years.
Of cource, whatever the result is, it is true that greenhouse gas has the effect to warm the earth.
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