A method and system for monitoring greenhouse gas emission from a vehicle. The vehicle is monitored for greenhouse gas emission, which includes identifying a running total of greenhouse gas emitted by the vehicle into an external environment that is external to the vehicle and activating a payment triggering condition when the emission exceeds the expected total. Satisfaction of a payment triggering condition that triggers collection of a required payment pertaining to the identified running total of greenhouse gas emitted is detected. Responsive to detecting the satisfaction of the payment triggering condition the required payment is computed as a function of the stored running total of greenhouse gas emitted.