Answer:

carbonfootprint

AnswerCrossword Clue
CARBONFOOTPRINTEnvironmental impact factor
CARBONFOOTPRINTDark gray piece of evidence for a tracker?
CARBONFOOTPRINTTelecommuting reduces it
CARBONFOOTPRINTWhat an environmentalist wants to reduce
CARBONFOOTPRINTMeasure of environmental impact