Which zero emission form of transportation holds the most promise?

2,723 votes
Human powered
 
25% / 671 votes
Animal powered
 
7% / 193 votes
Battery electric
 
28% / 754 votes
Compressed air
 
3% / 95 votes
Solar powered
 
13% / 343 votes
Flywheel energy storage
 
3% / 70 votes
Hydrogen
 
15% / 411 votes
Liquid nitrogen
 
5% / 128 votes
Sails
 
2% / 58 votes


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