Bill Clinton is proving once again he is not called the comeback kid for nothing. Last in Hong Kong to attend the Fortune Global Forum in May, the former US president will be here again on September 12 for 'An Evening with Bill Clinton', a fund-raising event for the World Wide Fund for Nature. Organisers will not say if he is being paid for his appearance, but the black-tie event at the Island Shangri-La hotel will not come cheap - a pair of tickets will cost $16,000 and a table of 12 from $120,000 to $200,000. 'Clinton is simply a very engaging and charismatic speaker,' an event spokesman said. 'No other leader in the world has his star quality or presence.' Mr Clinton is in great demand as a speaker around the world. The US-based Harry Walker Agency, which books his engagements, has assigned extra staff to keep up with demand. He commands US$100,000 (HK$780,000) a speech, with the fee typically higher outside the US. His speech next month will last for 45 minutes and range from reflections on his presidency, China's entry to the World Trade Organisation, and global environmental issues. The Clinton administration was noted for its commitment to environmental protection. Former vice-president Al Gore helped to engineer the 1997 Kyoto Protocol on combatting global warming, which was rejected by US President George W. Bush. Since March, Mr Clinton has been trotting the globe, speaking and hosting events that address humanitarian issues. Earlier this month he clinched a US$10 million deal to write his memoirs with publishing house Alfred A. Knopf.