The ________________________________________ may not be an efficient method of reducing emissions because it creates incentive to cheat and would have to be carefully monitored.

Emissions

The release of substances, such as gases, liquids, or particulates, into the air or water, often associated with pollution from industrial activities or vehicles.

Efficient Method

A process or technique that achieves a goal with minimal waste of time, resources, or energy, maximizing productivity and effectiveness.

Incentive to Cheat

A motivation or reason for individuals or entities to break rules or agreements to gain an advantage.