What will happen if our planet’s atmosphere warms 2 degrees Celsius during this century? I don’t know. I haven’t seen studies of warming to that extent (and I would welcome any links to studies that exist.)
What we’ve seen is mostly media reports of what will happen if temperatures rise much higher and most of those reports are pretty over-dramatic. But a careful study of modest temperature rises would be useful–after all, even if temperatures do climb higher, they will pass through the 2C range and perhaps stay there for quite a while.
The impacts that I have seen discussed are mostly on an unspecified gradient, which may be the best climate science can do at present. At some point between temperature rises of 1C and 4C, disruptions of large scale weather phenomena, such as the monsoon cycle, are expected to occur. But we don’t know at what point.
Similarly…
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Utopia, you are standing in it! 
Mar 16, 2016 @ 22:57:29
The IPCC latest assessment provides some insights in this:
http://www.ipcc.ch/report/ar5/wg2/
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