I want to know the answer to the following question:
What percent of the bus systems use alternate fuels?
All the background I'm provided with is that "The city first proposed its Sustainable City Plan in 1992 and in 1994, was one of the first cities in the nation to formally adopt a comprehensive sustainability plan, setting waste reduction and water conservation policies for both public and private sector through its Office of Sustainability and the Environment.". Is that enough to answer the question?
Answer: no