While it cannot be scientifically proven (or disproven, for that matter) that global warming caused any particular extreme event, we can say that global warming very likely makes many kinds of extreme weather both more frequent and more severe.
当无法在科学上证明（或者否定）全球变暖导致了任何极端气候状况的时候，我们可以说全球变暖很可能增加了多种极端气候状况的发生概率和严重程度。