(1.75 to 3 billion years according to one study) (1.75 to 3 billion years according to one study) How Much Longer Can Earth Support Life? last week (1.75 to 3 billion years according to one study) last week (1.75 to 3 billion years according to one study) How Much Longer Can Earth Support Life? (1.75 to 3 billion years according to one study) How Much Longer Can Earth Support Life? (1.75 to 3 billion years according to one study) (1.75 to 3 billion years according to one study) last week (1.75 to 3 billion years according to one study) (1.75 to 3 billion years according to one study) (1.75 to 3 billion years according to one study) LiveScience