Trees help to alleviate the effects of carbon emission, thus playing an important role in the ecosystem. On 11 May, Prof. Joseph J.Y. Sung (centre), Vice-Chancellor; Prof. Michael K.M. Hui (1st left), Pro-Vice-Chancellor; Prof. Xu Yangsheng (3rd right), Pro-Vice-Chancellor; Prof. Fung Tung (1st right), Associate Pro-Vice-Chancellor; Prof. Chu Lee-man (2nd left); and Prof. Leung Yee (2nd right); together with more than 200 CUHK members planted Hong Kong Gordonia saplings all over Luk Chau Shan inside Ma On Shan Country Park. The greening event was also in line with the call of the 'CU50 ‧ Care' programme for CUHK members to engage in 50 hours of community service.