Depends on how valid you consider statistics and climate modelling. We're seeing increasing numbers of events that are incredibly statistically unlikely in a cl

Depends on how valid you consider statistics and climate modelling. We're seeing increasing numbers of events that are incredibly statistically unlikely in a climate unaffected by anthropogenic climate change, so - can we say with absolute certainty that X was caused by climate change? That's hard. But we say that X was incredibly, unbelievably unlikely without climate change, and that's usually been a sufficient standard for accepting a hypothesis.