Trivia: What is the only national capital whose buses use 100% renewable energy?
Abu Dhabi
Athens
Stockholm
Ottawa
Correct Answer: Stockholm
So why is this answer correct? : One of the most ambitiously green cities in the world, Stockholm has officially declared a goal to be completely free of fossil fuels by the year 2050. A group called Region Stockholm announced a plan to make buses run completely on renewable energy by 2025, and they beat that goal by seven years. Since 2018, all buses in the Swedish capital have been running on fossil-free biofuel and ethanol.