as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
brainstorm a list of five sustainable methods of transportation.
user
five sustainable methods of transportation are: 
1. walking or cycling. 
2. electric vehicles. 
3. mass transit. 
4. hydrogen fuel cell vehicles. 
5. eco-friendly ridesharing.
assistant