 THE FUTURE for Kiribati, one of the low-lying Pacific nations threatened by rising seas, is so dire that the government is contemplating relocating the entire population to man-made islands resembling giant oil rigs.  "We're considering everything... because we are running out of options," the President of Kiribati, anote Tong, said yesterday in auckland, where he is attending the Pacific Islands Forum. He said that his small, impoverished country - where the highest land is no more than two metres above sea level - urgently needed the world to take action on climate change.  Vulnerable Pacific nations have acquired a powerful new ally, the UN Secretary-General, Ban Ki-moon, who visited Kiribati on his way to the auckland conference. In a speech on Tuesday, Mr Ban warned: "For those who believe climate change is about some distant future, I invite them to 