95% of hydrogen is produced using natural gas reforming. Hydrogen is ostensibly a fossil fuel when you consider how we produce it at a commercial scale.

Most natural gas comes from fracking, which may be a major air polluter in addition to many other known problems.

http://energy.gov/eere/fuelcells/hydrogen-production-natural...

http://blogs.wsj.com/corporate-intelligence/2015/04/01/how-m...

http://www.usatoday.com/story/news/nation/2014/12/16/frackin...