Lok Sabha Speaker Om Birla has said that terrorism not only damages the society but also significantly impacts the economy. Mr Birla, who is in Tokyo to attend the 6th Parliamentary Speakers' Summit of G 20 Countries, shared his views with Presiding Officers of Parliaments of G20 countries. <br />''<br />''He said, today the world is grappling with several challenges which not only obstruct the efforts towards development but also pose a serious threat to humanity.<br />''<br />''<br />