Which pricing strategy has been most effectively used by major airlines to promote sustainable travel choices while generating additional revenue?

In today's climate-conscious world, transportation companies are implementing innovative pricing strategies to promote sustainability while maintaining profitability. These approaches not only help reduce environmental impact but also appeal to eco-conscious consumers. This trivia question explores how major transportation providers are using pricing to influence consumer behavior and support green initiatives.

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Carbon offset surcharges that allow passengers to pay an additional fee to neutralize their flight's emissions
Fuel-efficiency discounts that reduce ticket prices based on the aircraft's emissions rating
Seasonal sustainability pricing that charges premium rates during peak pollution months
Distance-based green pricing that increases costs proportionally to flight distance regardless of fuel consumption