A carbon emission tracker is disclosed. The carbon emission tracker (10a) includes a main body (100a), a power input interface (101), a power output interface (103), a power detecting unit (102), a communication unit (105), a memory unit (106), and a processing unit (104). The power detecting unit (102) is configured to detect an electricity usage of an electrical appliance (60a). The processing unit (104) is configured to aggregate power consumption data over a time period and to store the power consumption data for the time period to the memory unit (106). The processing unit (104) transmits the power consumption data of the memory unit (106) to a data center (17) through the communication unit (105). The power consumption data further includes identification data of the electrical appliance (60a).
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