"... Due, in part to this ability to advance fuel economy through conventional engine technology, the Civic lineup will no longer include a hybrid or a natural gas model, as we will discontinue production of both of these products with the end of the 2015 model year.

Honda has promoted CNG-powered vehicles for many years. For most of the past 15 years we have been the only automaker with a dedicated CNG vehicle. Despite this commitment, the infrastructure for natural gas refueling and consumer demand remains a challenge. Production of the Civic Natural Gas model has been completed at our Indiana plant, but we will continue to provide a high level of service to our existing customers through CNG-certified Honda dealers. ..."

http://www.honda.com/newsandviews/article.aspx?id=8539-en