Hon SCOTT SIMPSON (National—Coromandel): Thank you, Madam Chair. Look, I didn't sit on the select committee that considered this legislation, so I'm coming to this with a view of a layperson. Some of the terms in the legislation are a bit perplexing, and I'm hoping that the Minister will be able to offer some advice about, for instance, the terminology in Part 1, clause 4(1), which refers to "fuel oil" at the bottom there. It means "any fuel delivered to and intended for combustion purposes for propulsion or operation on board a ship, including gas, distillate, [or] residual fuels", and what I'd like to know is: how was that definition arrived at and is it extensive enough? For instance, does it include futureproofing fuel sources? So does it, for instance, include the prospect of hydrogen fuel cell propulsion, and what about the potential for some vessels—I understand that Wellington is soon to have an electric tugboat in place. So I'm keen to know about what those various types of fuel might mean. 