Antarctic Bill

I apologise to my noble friend. I expect that I am being a bit thick, but I still do not understand why this word “accidental” is included in the definition of what constitutes an environmental emergency. I understand the point that he makes about deliberate action which causes damage being covered by other legislation, but it is not clear to me why the definition within the Bill of an environmental emergency is qualified by this word “accidental”. There are events that could be an environmental emergency that would not arise from an accidental activity.