How I can retrieve the CO2 generated in each country?

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For example, a routing from IT to DE.
You obtain two border events, that contains coordinate of CH border and coordinates of DE Border.

So you create the routing request with same date/hour for start waypoint to first border coordinates event and you obtain the
emission in IT (SUBROUTE1)
Then you create another routing from first border coordinates event and coordinates of DE Border events, so you obtain the emission in CH (subroute 2).
Last part is the routing from coordinates of DE Border events to end waypooints, so you obtain DE emission (subroute 3).

If you sum the values of subroute 1,2,3 of each value you obtain the correspondant values of the TOT routing.
TOT
            "fuelConsumption" 464.3700877300937
            "co2eTankToWheel" 1490.2261228838229
            "co2eWellToWheel" 1808.3642839489144
            "energyUseTankToWheel" 20037.12277585371
            "energyUseWellToWheel" 23832.45522364775

subroute 1
           "fuelConsumption" 187.40014261761294
            "co2eTankToWheel" 601.3922846021937
            "co2eWellToWheel" 729.7794015397415
            "energyUseTankToWheel" 8086.135961505168
            "energyUseWellToWheel" 9617.771742514484

subroute 2
           "fuelConsumption" 115.19104735955885
            "co2eTankToWheel" 369.66357746396847
            "co2eWellToWheel" 448.58052096751265
            "energyUseTankToWheel" 4970.382932942508
            "energyUseWellToWheel" 5911.84822386197

subroute 3
           "fuelConsumption" 161.78787220271914
            "co2eTankToWheel" 519.1990610351684
            "co2eWellToWheel" 630.0393100202045
            "energyUseTankToWheel" 6980.99112028564
            "energyUseWellToWheel" 8303.295845019364

Keywords: HowTo, CO2, CO2 emission, country emission