The Green Travel Carbon App first appeared in relation to GPS tracking PoC for a metro NRDC unit c. 2011. It was updated in 2021 to GT2, a complete app with foreground only tracking (2.0.7). GT2 3.0.0 updated in 2026 to use my common app platform (DSAP) and enable background operation (2.0.8).
GT2 3.0.1 (2.0.9) adds multi-leg trips, custom fuel setting, and switching from background execution back to foreground which completes the functional baseline begun with 2.0.8.
GT3 will be a full Personal Carbon Accounting domain in the Personal Motion Tracking Applications (PMTA) product line with advanced functions but GT2 will be maintained to keep the stack current.
Current sources are available in my forgejo repo and the original 2011 app sources are in my github.com/renrenjuan account.
Calculates carbon impact of a trip.