By Moristotle
My wife and I watched Sir David Attenborough’s biography of his (and Earth’s) life yesterday afternoon. Attenborough is 94 years old, near the end of his own life. And much of Earth’s life is also near its end, including human life, if we don’t act quickly to halt the Earth’s sixth major extinction event in its last 2.5 billion years. (The fifth occurred about 66 million years ago, following the collision of a large asteroid or comet – 7 to 50 miles in diameter – with the Earth, which led to the extinction of non-avian dinosaurs.)
