Reference M Jamil Ather's letter on global warming, I would request him to get hold of Al Gore's DVD 'The Inconvenient Truth'. Al Gore has impeccable credentials and one has to give credence to what he has said in this hour-long presentation. Global warming is very much here. It is in the vested interest of the big corporations to play it down because cutting down on greenhouse gases hits their pocket. That is why they are opposed. -KHURSHID ANWER, Lahore, via e-mail, August 8.