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Carbon intensity

A measure of how much greenhouse gas pollution is released throughout the entire life of a fuel (from production to use) for each unit of energy it provides. It's expressed in grams of carbon dioxide-equivalent per unit of energy.

Carbon dioxide-equivalent

A standard unit for measuring the global warming potential of different greenhouse gases. It converts the impact of other gases into the equivalent amount of carbon dioxide.

Covered voyage

A commercial trip by a vessel for passengers or cargo that either travels between two U.S. ports, or between a U.S. port and a foreign port.

Greenhouse gas

Gases in the Earth's atmosphere that trap heat, leading to global warming. Examples include carbon dioxide, methane, and nitrous oxide.

Lifecycle greenhouse gas emissions

The total greenhouse gas emissions associated with a fuel, including those from its production, transportation, and consumption.

Vessel

For the purpose of this bill, any ship that weighs 400 gross tons or more.

Port of call

A harbor or city where a ship stops to load or unload cargo, or to pick up or drop off passengers.