The first batch of visitors wearing low-carbon transport cards on their chests entered the Expo site on Wednesday, which attracted many people's attention.

The price of these transport cards are 40 yuan (US$5.80), of which 2o yuan goes to the cost of the card, and 20 yuan donated to a project on lowering carbon emissions. The donation from one such card can reduce one ton of carbon emissions.

The limited-distribution transport card is aimed to allow people to contribute directly to a low-carbon life by supporting the efforts to cut carbon emission.

Source: expo2010.cn