china thermostat manufacturer This one event alone does not signal the arrival of global warming. It can never be linked exclusively to one event. However, you can say very conclusively that global warming is occurring and it will increase the frequency of certain extreme weather events, more Katrinas. It’s just that this one past Katrina — or one singular event — cannot alone signal the arrival of global warming. Climate determines the frequency and probability of a weather event. It does not exclusively determine any one particular weather event.”