A simple but fully parameterized application to calculate the carbon footprint of a trip by various means. Originally developed core of this for One Penny Per Mile's Green Driving app c. 2011. Requires GPS. The sources are in my github account.
A new version is forthcoming in early 2017 for both platforms with new function. The entire end app on both platforms will be free (was originally $1 due to constraints in Play at that time) going forward but some sources may be only in my private git repo. Sources for base app eclipse and xcode projects will continue to be available at github.