3.2.1. Evaluation Index System of Tourism's Carbon Emission Efficiency (TCEE)

The input-output index system of TCEE was established as shown in Table 1. Among them, energy input was expressed by the ratio of the tertiary industry energy consumption to the total energy consumption. The desirable output included tourism income and tourist reception. Tourism income was measured by the ratio of the sum of the income of star hotels, travel agencies, and tourist attractions to the total tourism income, and tourist reception was measured by the ratio of the total number of tourists in tourist attractions to the total number of tourists.

**Table 1.** Evaluation index system of tourism's carbon emission efficiency (TCEE).

