Well we've got a significant amount of CO2 in the atmosphere now, an amount not seen for 4.5 million years when the Earth was a very different place. So the weather systems are going to change to adapt to the new conditions of the atmosphere. It's not likely to happen overnight, there's a lag-time of an unknown period of years where the weather is going to change before it stabilises, that's if, of course, the amount of CO2 stabilises which at its current rate it isn't, and indeed, by the 2040s we could be looking at 450-500ppm of CO2, which hasn't been seen for a very very long time and would not be a good thing at all.
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