Which transportation sustainability initiative was the first to achieve carbon-neutral operations across an entire urban bus fleet without relying on carbon offsets?

The transportation industry is undergoing a remarkable transformation toward sustainability. From electric vehicles to carbon-neutral shipping, companies are innovating to reduce their environmental footprint. This trivia question tests your knowledge about a significant sustainability initiative that changed how we think about eco-friendly transportation solutions. Can you identify which pioneering project represented a true turning point in sustainable transport?

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Stockholm's Renewable Biogas Bus Program (2011)
London's Electric Bus Initiative (2013)
Singapore's Hydrogen-Powered Transit System (2015)
Portland's Zero-Emission Transit Plan (2010)