Well, 4°C temperature change do not sound scaring, you have that between night and day. Usually the majority estimates consequences of climate change from their

Well, 4°C temperature change do not sound scaring, you have that between night and day. Usually the majority estimates consequences of climate change from their past experience. The thing is nobody ever experienced a +4°C anomaly driven by CO2 in 200 years (probably even not this planet). So, forget about what you've learned about weather and expect the worst and multiply this by two. In other words our uncontrolled experiments with the atmosphere do not lead to a weather upgrade, it is more of a system change - introducing bugs and BSODs.