Which transportation sustainability initiative was the first to achieve widespread industry adoption, reducing carbon emissions by over 25% within its first five years of implementation?

The transportation industry is rapidly evolving with sustainability as a key focus. Companies are implementing various initiatives to reduce their environmental footprint while maintaining operational efficiency. This trivia question tests your knowledge about a groundbreaking sustainability initiative in the transportation sector that has changed industry standards and practices. Can you identify the correct pioneering sustainability initiative?

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The International Maritime Organization's (IMO) 2020 sulfur cap, limiting sulfur in ship fuel to 0.5% (down from 3.5%)
The Hyperloop vacuum tube transport system, which eliminated air resistance for high-speed transit
The Universal Electric Aircraft Initiative, mandating all new commercial aircraft be electric-powered by 2025
The Global Freight Carbon Trading Program, creating a marketplace for transportation companies to trade emission credits