In the last 1.5 years, the number of people in poor regions receiving AIDS treatment has risen by 600,000. If that rate of increase continues for 5 years, then about 2 million more people will receive treatment. If treatment extends life by, say, 25 years, that means 50 million life-years will be saved. In addition, treatment improves prevention efforts. Perhaps another 2 million people will be prevented from HIV infection, saving perhaps 35 years of life each, or 70 million life-years.
At 40,000 life-years/character, that allows 3000 characters. This article has about 3000 characters.