President says terrorism poses big challenge to the world and united efforts are needed to fight the menace. President Asif Ali Zardari has proposed to start a train service between Pakistan and China to further improve people to people contacts. He said the future of the region is attached with the Shanghai Cooperation Organisation. He said Pakistan is eager to have more active role in the Organization by getting permanent membership. President Zardari said terrorism is a big challenge for the whole world and joint efforts are needed to fight it. He said terrorism is not an issue of Pakistan but of the entire world and it is not appropriate to expect Pakistan to fight it alone. The President described his visit to China as successful in every respect.