@freddieethan Thanks for your question and interest in Travlee!
The route planning works like any standard app out there, Google Maps and so on, giving you a selection of routes that are available from a location to another
The carbon calculation is done by taking the different modes of transport for the route and using an average carbon emissions per mile and combining these values together
And the offsetting side of it is done by planting trees using local conservation projects around the UK, 100% of the money spent purchasing trees goes to these organisations
GitNoter
Travlee
FineCam
Travlee
Travlee