It's my impression that Canada had a very mild winter, whereas Europe had a harsh one. I read somewhere that the arctic weather tilted this way this winter, and that this happens now and then. I have no idea. I think that we have difficulties understanding both climate and weather at the moment. Gaia is very complex. This planet is not yet fully explored, and we don't really fully understand viruses, weather, the suns behavior and effects. We can't yet say exactly what is happening, and cannot predict exactly what is going to happen.
I don't dispute that we are affecting the climate. I really hope that the climate change is entirely man made. Then we can do something about it. Otherwise, we are in much deeper trouble. Risks are that all combined wars pale in comparison to what might happen to human societies across the world. The majority of the world populations might just be turned into refugees. In the footsteps of disaster across the world, migration will soar and wars will likely flame up all over the globe.
This is urgent research, and urgent for us to do something about.
But as a side note I wonder Maciamo - when you say that it would be irreversible for thousands or maybe hundreds of thousands of years - would the gulf stream still be affected if there is no ice left in the arctic? No doubt, warmer global climate doesn't mean warmer weather everywhere, but if it's so warm that the polar cap melts, would we need the gulf stream to make our climate warm and Europe habitable?