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It's not like greenhouse effects on a Venus level would ever occur.
But a whole lot of other things. Mainly stuff plants don't care as much about as we do.
+2° Celsius already mean there is a whole lot more of energy in the global weather system. A warmer overall climate can lead to local weather extremes in bith directions though. Polar storms might get extremer and reach far more south and another region might dry out, you can even have more desertification in some areas.
More CO² makes the oceans more acidic than they are now. Which will be bad for reefs, scallops etc but good for algae. Algal blooms might lead to less oxygen in the water (not good for the fishies) and so on.

So, good for plants, not neccessarily good for humans.